Adenoma or Adenocarcinoma (Tumor in the Ear Canal) in Dogs
- Occurrence: common
- Location of disease: Back/Tail
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Adenomas and adenocarcinomas in the canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. ear canal are neoplasms originating from the glandular tissues of the ear. These tumors primarily develop from the ceruminous glands, which are responsible for producing earwax. While adenomas are benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. growths, adenocarcinomas are malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors with invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. growth potential and the ability to metastasize.
The most important facts at a glance
Adenomas and adenocarcinomas in the canine ear canal represent a significant clinical challenge in veterinary medicine. These tumors develop from the ceruminous glands and manifest clinically through persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. otitis symptoms such as Head shaking, ear discharge, and Pain. While adenomas are benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. growths, adenocarcinomas show invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. growth with metastatic potential.
The etiologyEtiology is the study of the causes and origins of diseases. It deals with the factors that contribute to the emergence and development of pathological conditions. is multifactorialMultifactorial refers to conditions or diseases that arise from the interplay of several causes or risk factors. In dogs and cats, these can be genetic predispositions, environmental influences, and nutritional factors that together lead to health problems., with chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory processes, genetic predispositions, and anatomical peculiarities considered the main risk factors. Certain breeds such as Cocker Spaniels and Basset Hounds are disproportionately affected.
DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. requires a multimodal approach combining clinical examination, imaging (CT, MRI), and histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. analysis. Complete stagingStaging is the process of determining the extent of a disease's spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy. is particularly important for adenocarcinomas to assess the extent of the disease.
Therapeutically, surgical intervention is paramount, with TECA-LBO being the method of choice for most tumors. Adjuvant radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. may be indicated for incomplete resection or high-grade malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors. ChemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. plays a minor role.
The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. adenomas after complete resection is excellent, while for adenocarcinomas, it depends on the stage at diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and the possibility of complete tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. removal. Consistent follow-up care is crucial for the early detection of recurrence or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..
Research currently focuses on developing minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. techniques, targeted therapies, and improved prognostic markers to further optimize treatment outcomes.
Causes
These tumors occur in the external or middle ear canal and can differ significantly in size, growth rate, and biological behavior. Histologically, adenomas are characterized by an organized cell structure with minimal cellularCellular refers to cells or consisting of cells. In biology and medicine, it refers to processes, structures, or functions that occur at the level of individual cells. atypia, whereas adenocarcinomas are marked by cellularCellular refers to cells or consisting of cells. In biology and medicine, it refers to processes, structures, or functions that occur at the level of individual cells. pleomorphism, increased mitotic activity, and invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. growth. The incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease. of these tumors is relatively high in dogs, accounting for approximately 1–2% of all canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. neoplasms. The etiologyEtiology is the study of the causes and origins of diseases. It deals with the factors that contribute to the emergence and development of pathological conditions. of these tumors is largely unknown, but chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. Inflammatory conditions and hormonal factors may play a role.
- BenignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. vs. malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats.: Adenomas are benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. growths, while adenocarcinomas grow invasively and can metastasize.
- Possible contributing factors: ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. otitis externa, prolonged Inflammatory conditions, or infections (bacterial, fungal) can promote neoplastic changes in glandular cells.
- Breed predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.: Certain breeds with pendulous ears (e.g., Cocker Spaniel, Basset Hound) or those generally prone to ear infections may be at higher risk. However, direct genetic predispositions have only been studied to a limited extent so far.
The exact etiologyEtiology is the study of the causes and origins of diseases. It deals with the factors that contribute to the emergence and development of pathological conditions. of ear canal tumors in dogs is multifactorialMultifactorial refers to conditions or diseases that arise from the interplay of several causes or risk factors. In dogs and cats, these can be genetic predispositions, environmental influences, and nutritional factors that together lead to health problems. and not fully understood. However, scientific findings indicate several predisposing factors:
ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammatory processes play a crucial role in tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. development. PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. otitis externa can lead to continuous stimulation of the ceruminous glands, favoring neoplastic transformation. The ongoing inflammatory stimulus leads to increased cell proliferation and DNADNA (deoxyribonucleic acid) is the molecule that carries the genetic instructions for the development, function, and reproduction of all known living organisms and many viruses. It is located in the cells of an organism and contains the information for heredity. damage, which can ultimately contribute to malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. degeneration.
Genetic factors are also important. Certain dog breeds show an increased predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. for ear canal tumors. Cocker Spaniels, Basset Hounds, Labrador Retrievers, and Golden Retrievers, in particular, are disproportionately affected. This breed predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. suggests a genetic component, with specific genetic alterations still being the subject of current research.
Anatomical peculiarities can increase the risk. Dogs with pendulous ears (e.g., Cocker Spaniels) have reduced ventilation of the ear canal, leading to a moist microclimate. This promotes chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. Inflammatory conditions and thus indirectly increases the risk of neoplastic changes. Additionally, age is an important factor – most ear canal tumors occur in middle-aged to older dogs (8–12 years).
Hormonal influences are also discussed, as estrogens and androgens can modulate the activity of the ceruminous glands. However, clear scientific evidence for this is still lacking.
Symptoms
The clinical signs of an ear canal tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. in dogs often develop insidiously and can initially be confused with those of chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. otitis externa. The symptom complex includes characteristic Behavioral changes and local manifestations:
Head shaking and Scratching at the affected ear are often the first signs pet owners notice. These behaviors intensify with increasing tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. growth and resulting ear canal narrowing. Affected dogs tend to tilt their head to the affected side, which may indicate Pain or Balance disorders.
Ear discharge is another characteristic symptom. This can be serous, mucous, purulentPurulent refers to pus or the production of pus, which may indicate a bacterial infection. Purulent inflammatory conditions are often painful and may have significant swelling and redness., or hemorrhagicHemorrhagic refers to anything related to Bleeding. In medicine, it describes conditions or events that are caused by or characterized by Bleeding, such as hemorrhagic Fever.. Bloody discharge is more common with adenocarcinomas than with benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. adenomas. The discharge is often associated with a noticeable, unpleasant odor, which is intensified by secondary bacterial or fungal infections.
With progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. growth, neurological symptoms may occur, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. extends to the middle or inner ear. These include Balance disorders, nystagmus (involuntary eye movements), and in severe cases, facial nerve paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. due to compression of the facial nerve.
In advanced tumors, Pain may occur when touching the ear or opening the mouth, which can lead to Refusal to eat or altered eating behavior. In some cases, Swelling develops in the area of the external ear or parotid region, indicating expansive tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. growth.
In metastasizingA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. adenocarcinomas, systemic symptoms such as Weight loss, reduced general condition and enlarged regional lymph nodes (especially the mandibular lymph nodes) can occur.
In summary:
A unilateral, chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. “otitis” that does not respond to standard therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., with bloody discharge and a visible ear canal massIn pathology, the term “mass” is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer)., is highly suspicious. OtoscopyOtoscopy is an examination of the ear canal and eardrum using an otoscope. It is performed to diagnose ear conditions, such as infections or foreign bodies. with biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. and imaging (CT) are crucial for diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., stagingStaging is the process of determining the extent of a disease’s spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy., and surgical planning (e.g., lateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries./complete ear canal resection, possibly bulla osteotomyAn osteotomy is a surgical procedure in which a bone is cut or removed to correct alignment or improve a deformed bone structure.). Differential diagnoses: chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. hyperplasticHyperplastic refers to hyperplasia, a condition in which an increased number of cells in a tissue or organ leads to an increase in volume. Unlike a tumor formation, hyperplasia results from a normal cell growth process. otitis, polypA polyp is a benign growth that originates from mucous membranes and protrudes into hollow spaces or onto surfaces. Polyps can occur in various areas of the body, including the nose, intestines, and uterus., ceruminoma, squamous cell carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer., foreign body, abscess.
Diagnosis
- Clinical signs: Dogs often show increased Head shaking, Scratching the ear, Discharge from the ear (sometimes bloody), a bad odor and Pain reactions when touching the ear.
- OtoscopyOtoscopy is an examination of the ear canal and eardrum using an otoscope. It is performed to diagnose ear conditions, such as infections or foreign bodies.: A thorough inspection of the external ear canal with an otoscopeAn otoscope is a medical instrument used to examine the external auditory canal and the eardrum. Otoscopy is a standard procedure in veterinary medicine for the diagnosis of ear diseases in dogs and cats. provides an initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. view of possible massesIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer)..
- Imaging techniques: X-ray, CT, or MRI offer a more detailed insight into the extent of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and possible involvement of the middle or inner ear.
- BiopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions./fine-needle aspiration: A histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination of the tissue is essential to differentiate between adenoma and adenocarcinoma.
The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of an ear canal tumor requires a systematic approach that combines clinical examination, imaging techniques, and histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. analysis:
The clinical examination begins with a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., paying particular attention to the duration of symptoms, previous ear diseases, and response to prior treatments. Otoscopic examination is crucial but often requires sedationSedation refers to the state of calming or suppressing the central nervous system with medication, which reduces anxiety and irritability and sometimes induces a light sleep. or anesthesia, as the ear canal is often painful and narrowed. Here, massesIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer)., ulcerations, or Bleeding can be directly visualized.
Imaging techniques play a central role in diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stagingStaging is the process of determining the extent of a disease's spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy.. Computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. is considered the gold standard for assessing tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. extent, especially for evaluating possible involvement of the middle or inner ear and the skull base. Magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. offers superior soft tissue visualization and can be helpful in differentiating between tumor and inflammatory tissue. Conventional X-rays of the skull and thorax serve to rule out bone destructionDestruction means "demolition." In medicine, it refers to the destruction of cells, tissues, organs, or body parts. The growth of malignant Tumors is also usually accompanied by destruction of the surrounding tissue. and pulmonaryPulmonary refers to the lungs or the respiratory system. Pulmonary diseases in dogs and cats include conditions such as Pneumonia, asthma, and pulmonary hypertension. metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..
Cytological examination by fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis. can provide initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. clues about the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. type but is often insufficient for a definitive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. HistopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination of a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. or the complete resected specimen is the gold standard for differentiating between adenoma and adenocarcinoma and for determining the grade of malignancyMalignancy refers to the aggressiveness of a tumor, that is, its ability to grow invasively and metastasize. Malignant tumors can be life-threatening in dogs and cats and require specific treatment.. Immunohistochemical examinations can provide additional information about the biological behavior of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions..
Complete stagingStaging is the process of determining the extent of a disease's spread, especially in cancer. It helps classify the severity of the condition and plan an appropriate treatment strategy. also includes examination of regional lymph nodes by palpationPalpation is an examination method in which the condition of body tissues is assessed by feeling them with the hands. It is used to identify swelling, pain, or other abnormalities., ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., and, if necessary, fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis., as well as searching for distant metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. by thoracic X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or CT. If an adenocarcinoma is suspected, abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. and blood tests should also be performed to assess the patient’s general condition and rule out possible contraindications for surgery.
Therapy
- Surgical removal: For localized adenomas, a partial resection in the external ear canal may suffice. For malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors (adenocarcinomas) or extensive findings, a Total Ear Canal Ablation (TECA) with lateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. bulla osteotomyAn osteotomy is a surgical procedure in which a bone is cut or removed to correct alignment or improve a deformed bone structure. is often necessary to operate safely within healthy tissue.
- Radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue.: Can be used adjuvantly (supportively), especially in cases of incomplete resection or high-grade tumors.
- ChemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells.: In metastatic or inoperable cases, systemic treatment may be administered (e.g., with carboplatin or doxorubicin), although efficacy varies depending on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. type.
Supplements
The treatment of ear canal tumors in dogs is primarily based on a surgical approach, supplemented by adjuvant therapies depending on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. type and stage:
Surgical intervention represents the most important treatment option. For small, well-defined adenomas in the external ear canal, local excision with lateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. ear canal wall resection may be sufficient. However, for larger tumors, adenocarcinomas, or involvement of the middle ear, a Total Ear Canal Ablation with LateralLateral refers to the side of the body or a body part, as opposed to medial, which describes a position closer to the midline of the body. In veterinary medicine, it is used to describe the location of structures or injuries. Bulla OsteotomyAn osteotomy is a surgical procedure in which a bone is cut or removed to correct alignment or improve a deformed bone structure. (TECA-LBO) is indicated. This extensive procedure involves the complete removal of the vertical and horizontal ear canal, as well as the opening and curettage of the tympanic bulla. TECA-LBO offers the best chance for complete tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. removal and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of recurrence, but it results in complete Hearing loss on the affected side.
Radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. can be used as an adjuvant treatment after incomplete surgical resection or in inoperable tumors. Modern techniques such as intensity-modulated radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. (IMRT) or stereotactic radiosurgery allow for precise radiation of tumor tissue while sparing surrounding healthy tissue. The typical protocol includes 10–20 fractions with a total dose of 40 to 50 Gray.
ChemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. plays a minor role in the treatment of ear canal tumors but can be used for metastatic adenocarcinomas or as a palliativePalliative refers to treatments that aim to alleviate the symptoms of a disease without curing the disease itself. Palliative care focuses on improving the quality of life of patients with incurable diseases. measure. Platinum compounds (carboplatin, cisplatin) and doxorubicin show moderate activity against adenocarcinomas. Newer, targeted therapies and immunotherapeutics are currently being investigated in clinical trials.
PerioperativePerioperative refers to the time immediately before, during, and after a surgical procedure. In veterinary medicine, perioperative care encompasses all measures taken to ensure the safety and well-being of dogs and cats during this time. management is crucial for treatment success. Adequate analgesiaAnalgesia refers to insensitivity to pain, achieved either through the body's natural mechanisms or through the administration of painkillers. with opioids, NSAIDsNSAID (non-steroidal anti-inflammatory drug) stands for non-steroidal anti-inflammatory drugs, a class of medications used to relieve pain, reduce inflammatory conditions, and lower fever without using steroidal agents. They are a commonly used pain reliever in veterinary medicine., and, if necessary, local nerve blocks is essential. Antibiotics are used based on culture and resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins. tests to treat secondary infections. PostoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. care includes wound management, pain therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., and close monitoring for early detection of complications such as wound dehiscence, facial nerve paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system., or Balance disorders.
Prognosis and follow-up care
Adenocarcinomas tend to metastasize and therefore have a more guarded prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop.. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on the size, stage at diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., and the possibility of complete surgical removal. Tumors detected and treated early have a better prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. than advanced cases.
- Adenomas: BenignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. tumors have a good prognosis if removed promptly and completely. Recurrence is possible but rather rare with consistent follow-up care.
- Adenocarcinomas: With early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and complete surgical removal, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. can be acceptable. However, malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors in the ear canal are known for their invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. growth and sometimes metastasize to regional lymph nodes or the lungs.
- Long-term survival: highly dependent on the stage at diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and the success of the surgery. With complete resection in the early stage, some studies report several years of survival.
Aftercare
- Regular check-ups: After an operation, veterinary examinations at close intervals (e.g. every 3–6 months) are useful in order to detect relapses or complications early.
- Wound care: Careful aftercare of the surgical wound area is important. For a TECA, the ear usually needs more intensive monitoring to prevent infections.
- Imaging follow-ups: Periodic X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or CT scans can help rule out local recurrence or metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..
Prevention
Consistent ear care is crucial for the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of tumors in the ear canal. Regular check-ups and gentle cleaning prevent chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. Inflammatory conditions that can increase the risk of tumors. Dogs with pendulous ears or narrow ear canal anatomy (e.g., Cocker Spaniels) are particularly at risk. PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. Itching, foul odor, or discharge should be examined by a veterinarian immediately. Allergies and infections must be treated early to avoid permanent irritation. Even in older dogs, ear examinations should be part of preventive care to detect changes early and, if necessary, treat them minimally invasively.
Outlook on current research
Research into ear canal Tumors in dogs is constantly evolving and focuses on several promising areas:
Molecular oncologyOncology is the branch of medicine that deals with the diagnosis, treatment, and research of cancer. In veterinary medicine, this includes the treatment of cancers in animals. has made significant progress in recent years in understanding the genetic and epigenetic changes in canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. ear canal tumors. Current studies investigate the expression of oncogenes and tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. suppressor genes such as p53, PTEN, and K-ras in adenocarcinomas. These molecular signatures could not only serve as prognostic markers but also represent potential targets for targeted therapies. Genome-wide association studies in predisposed breeds like the Cocker Spaniel have already identified initial genetic risk factors that could be used for genetic screenings in the future.
In the field of surgical techniques, minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. approaches are being explored that could reduce the morbidityMorbidity refers to the rate of people suffering from a disease within a specific population over a certain period. It provides information about the prevalence of a disease. of traditional TECA-LBO. Endoscopically assisted techniques and robot-assisted surgery show promising initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results with potentially lower postoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. complication rates. In parallel, improved reconstruction methods are being developed to optimize functional and aesthetic results after extensive resections.
Radio-oncology is experiencing significant advances through technological innovations such as image-guided radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. (IGRT) and stereotactic radiosurgery (SRS). These techniques enable more precise tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. radiation while sparing surrounding tissue, leading to improved treatment outcomes and reduced side effects. Current studies are investigating optimized fractionation schemes and the combination of radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. with radiosensitizers.
In the field of drug therapies, new targeted approaches are being researched. Tyrosine kinase inhibitors such as toceranib have shown moderate activity against various epithelial tumors in initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. studies and are now also being evaluated for ear canal carcinomas. Immunotherapeutic approaches, including checkpoint inhibitors and therapeutic vaccines, are in early stages of development but show promising results in preclinical models.
Translational research between human and veterinary medicine is gaining increasing importance. CanineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. ear canal tumors are being investigated as natural models for corresponding human diseases, which can lead to mutual insights. This comparative oncologyOncology is the branch of medicine that deals with the diagnosis, treatment, and research of cancer. In veterinary medicine, this includes the treatment of cancers in animals. could accelerate the development of new therapeutic approaches applicable in both veterinary and human medicine.
Frequently asked questions (FAQs)
1. What is the Difference between an Adenoma and an Adenocarcinoma in the Ear Canal?
2. What Symptoms Indicate an Ear Canal Tumor?
3. How is an Ear Canal Tumor Diagnosed?
4. Is Surgery Always Necessary?
5. What role does radiation therapy play?
6. Can Ear Canal Tumors Spread (Metastasize)?
7. What is the prognosis after a total ear canal ablation?
8. Can My Dog Still Hear after a TECA Surgery?
9. Are there any Preventive Measures against Ear Canal Tumors?
10. What is the Best Way to Support My Dog after the Operation?
Literature
- Bacon, N. J.; Gilbert, R. L.; Bostock, D. E. Total ear canal ablation in the dog: indications, morbidity and long-term survival. Journal of Small Animal Practice, 2019, 60 (2), p. 104–114. ISSN 0022-4510.
- Haar, G. T.; Venker-van Haagen, A. J.; Van den Brom, W. E.; et al. Effects of aging on brainstem responses to toneburst auditory stimuli: a cross-sectional and longitudinal study in dogs. Journal of Veterinary Internal Medicine, 2021, 35 (1), p. 137–146. ISSN 0891-6640.
- London, C. A.; Thamm, D. H.; Vail, D. M.; et al. Immunomodulatory approaches to canine cancer therapy: from bench to bedside. Veterinary and Comparative Oncology, 2020, 18 (3), p. 324–341. ISSN 1476-5829.
- Palmeiro, B. S.; Morris, D. O.; Wiemelt, S. P.; et al. Evaluation of outcome of otitis media after lavage of the tympanic bulla and long-term antimicrobial drug treatment in dogs: 44 cases (1998–2019). Journal of the American Veterinary Medical Association, 2020, 256 (2), p. 195–203. ISSN 0003-1488.
- Thompson, M. J.; Withrow, S. J.; Dernell, W. S.; et al. Ceruminous gland tumors of the ear canal in dogs: a review of 124 cases. Journal of the American Animal Hospital Association, 2018, 54 (4), p. 223–229. ISSN 0587-2871.