Home » Diseases » In dogs » Leiomyoma of the Intestine (Intestinal Tumor from the Muscle of the Intestinal Wall)

Leiomyoma of the Intestine (Intestinal Tumor from the Muscle of the Intestinal Wall) in Dogs

Occurrence: very rare
Location of illness: Abdomen/pelvis

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

A leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs is a 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. 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. that originates from the smooth muscle of the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall. These Tumors can occur in various parts of the digestive tract but are often located in the stomach or small intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients..

The most important facts at a glance

A leiomyoma of the intestine in dogs is a benign tumor that arises from the smooth muscle cells of the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall. These cells are responsible for the movement of food through the digestive system. Although the exact causes of leiomyoma development are not fully understood, genetic and environmental factors may play a role. Older dogs are more commonly affected, and 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. irritation or inflammation of the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall may contribute to 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. formation.

Symptoms of a leiomyoma can include Vomiting, Weight loss, Flatulence, and bloody feces. 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. is made through clinical examinations, imaging procedures such as X-rays or 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 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. to confirm the 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. nature 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.. The primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. treatment is surgical removal 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 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. is generally favorable 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. can be completely removed. Regular follow-up examinations are important to avoid complications.

Since the exact causes are unknown, there are no specific preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures. However, a balanced diet, regular exercise, and veterinary examinations can contribute to overall intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. health. Research on leiomyomas in dogs focuses on genetic and molecular mechanisms, the development of less 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. diagnostic methods, and the improvement of surgical techniques. The exploration of drugs to control 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 the possible role of immunotherapy are also subjects of current studies.

Causes

Leiomyomas 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. Tumors composed of smooth muscle cells. These cells are responsible for contraction and movement within the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall, which facilitates the movement of food through the digestive system. Unlike 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, which can spread to other parts of the body, 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 like leiomyomas remain localized.

The exact cause of leiomyoma development in dogs is not fully understood. It is believed that genetic factors may play a role, as well as environmental factors that affect cell division and proliferation. There is no specific 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., although some studies suggest that older dogs are more commonly affected.

Another possible cause could be 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. irritation or inflammation of the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall, leading to increased cell division. Hormonal factors have also been investigated as contributing to 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. formation, but there is currently no conclusive evidence to confirm hormonal influences in dogs.

Symptoms

Very common symptoms:

Common symptoms:

The symptoms of a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs can vary and often depend on the size and exact location 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.. Smaller Tumors may remain asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult., while larger Tumors can lead to a variety of digestive problems.

The most common symptoms include Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems. or constipationConstipation is another word for infrequent bowel movements where the stool is hard and difficult to pass. In dogs and cats, this can be caused by diet, lack of exercise, or underlying health issues., Weight loss, and a general decrease in appetite. In some cases, there may be blood in the stool or a bloated abdomenThe abdomen, also known as the abdominal cavity, is the part of the body located between the rib cage and the pelvis. It houses several important organs, including the stomach, liver, kidneys, intestines, and spleen., which may indicate an obstructionobstruction refers to the blockage or narrowing of a hollow organ or canal, which hinders the normal flow of liquids or gases. In dogs and cats, an obstruction can occur in the digestive tract, airways, or urinary tract and often requires immediate medical treatment. or twisting of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients..

In advanced cases, dogs may appear lethargic and show signs of 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. pain. It is important to seek veterinary examination if such symptoms occur to determine the cause and begin appropriate treatment.

Diagnosis

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 a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. is usually made through a combination of clinical examination, imaging procedures, and histological examination. The veterinarian will first take a complete 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. and examine the dog thoroughly.

Imaging procedures such as X-rays or 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. examinations can be used to determine the location and size 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.. In some cases, an endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes. may be required to obtain direct visual information about the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. and to take tissue samples.

The final 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. is made by 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., in which a tissue sample of the Tumor is taken and examined under a microscope. This examination helps to confirm the 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. nature 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 to rule out other possible causes for the symptoms.

Therapy

The primary treatment for a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs is surgical removal 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.. This requires a procedure in which the affected portion of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. is resected and the remaining intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. ends are reconnected. This procedure can be complicated, especially if the Tumor is large or located in a difficult-to-access area.

After surgery, the dog is usually monitored for a few days to ensure that the healing process proceeds without complications. During this time, it may be necessary to administer special diets or medications to support digestion and reduce inflammatory conditions.

In rare cases where complete removal of the Tumor is not possible, 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. treatment may be considered to improve the dog’s quality of life. This could include symptomatic treatments such as pain relievers or special diets.

Prognosis and follow-up care

The prognosis for dogs with a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. is generally favorable, 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. can be completely removed. Because leiomyomas are benign, the risk of metastasisA 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. or recurrence after successful surgery is low.

The dog’s complete recovery depends on several factors, including the animal’s general condition, age, and whether there are other health problems. 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 treatment, most dogs can have a normal life expectancy and maintain a good quality of life.

It is important to perform regular follow-up examinations to ensure that no complications occur and to monitor the dog’s general health.

Prevention

Since the exact causes for the development of leiomyomas in dogs are not fully understood, there are no specific preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures.

A balanced diet, regular exercise, and avoiding overfeeding can contribute to maintaining intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. health overall. It is also advisable to carry out regular veterinary examinations to detect and treat possible health problems early on.

If a dog shows signs of digestive problems, it should be examined by a veterinarian as soon as possible. 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 treatment can help avoid serious health problems and improve the prognosis.

Outlook on current research

Leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs 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. Tumors that arise from the smooth muscle of the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall. Research on this disease is still in its early stages, as the focus in veterinary medicine is often on 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, which pose a greater threat to the animal’s life. Nevertheless, interest in 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 such as leiomyoma is gaining importance, as they can also significantly affect a dog’s quality of life. Current studies focus on the genetic and molecular mechanisms that lead to the formation of leiomyomas. This research aims to identify potential genetic markers that could contribute to early detection.

One of the most promising developments in research is the investigation of biomarkers in the blood that could indicate the presence of leiomyomas. This non-invasive method could help facilitate 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. in the future and reduce the need for 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. procedures such as biopsies. In addition, research is being conducted on how a dog’s environmental factors and diet affect the risk of developing leiomyomas. 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. evidence suggests that a balanced diet and regular exercise may reduce the risk, but further research is needed to confirm these hypotheses.

Another area of research focuses on improving surgical techniques for removing leiomyomas. Minimizing complications and shortening recovery time after surgery are important goals. Researchers are developing advanced techniques, such as laparoscopic surgery, which is less 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. and allows for faster healing times. These approaches could revolutionize standard treatment methods in the future.

In addition, research is being conducted on how medications can be used to slow down or stop the growth of leiomyomas. Some studies are examining the effectiveness of drugs that specifically target cell proliferation to control the growth of the Tumors. These drug approaches are still in the experimental phase but could become an important addition to surgical treatments in the coming years.

The role of immunotherapy in the treatment of leiomyomas is also being investigated. Although this approach is mainly tested in 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, there are considerations as to how the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. could also play a role in 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 such as leiomyomas. Research in this area is not yet far advanced, but the first results are promising and could open up new treatment options.

In conclusion, interdisciplinary collaboration between veterinarians, oncologists, and geneticists is crucial to deepen the understanding of leiomyomas. This collaboration makes it possible to conduct more comprehensive studies and develop new approaches to 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 treatment. The future of research on leiomyomas in dogs looks promising, and significant progress is expected in the coming years.

Frequently asked questions (FAQs)

What is a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs? A leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. is a benign tumor that arises from the smooth muscle of a dog’s intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. wall. These Tumors are non-cancerous but can cause symptoms due to their size and location.
What symptoms can occur in a dog with a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients.? Common symptoms include Vomiting, DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., Weight loss, loss of appetite, and sometimes Pain in the 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. area. The symptoms can vary depending on the size and location of the Tumor.
How is a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. diagnosed? 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. is usually made by imaging procedures such as 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. or X-ray, supplemented by 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. to confirm the type of Tumor.
What treatment options are available for leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs? The primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. treatment method is surgical removal 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.. In some cases, drug 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. can be used for support.
Is 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. good for dogs with a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients.? Yes, since leiomyomas 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., 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. after surgical removal is usually good, and most dogs recover completely.
Can leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. become 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? Leiomyomas are inherently 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. and do not usually become 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.. However, it is important to monitor them to ensure that they do not cause any problems.
How common are leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs? Leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. are relatively rare compared to other types of Tumors in dogs. They occur more frequently in older dogs.
Are there certain dog breeds that are more susceptible to leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients.? There are no specific dog breeds that are known to be more susceptible to leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients., but older dogs are generally at higher risk.
Can you help a dog with a leiomyoma of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. without performing surgery? In some cases, 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. is small and does not cause any symptoms, a wait-and-see approach can be taken, with the dog being monitored regularly. A change in diet and lifestyle can also be helpful.
How can you reduce the risk for leiomyomas of the intestineThe intestine is the medical term for the gut, including the small intestine (intestinum tenue) and the large intestine (intestinum crassum). It plays a central role in the digestion and absorption of nutrients. in dogs? A balanced diet, regular exercise, and regular veterinary examinations can help reduce the risk for the development of leiomyomas and other health problems.

You can find an interesting overview of gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. problems in dogs, supplemented with information on the intestinalIntestinal refers to the intestine, the part of the digestive tract that extends from the stomach to the anus. Intestinal diseases affect the small and/or large intestine. microbiome and the importance of probiotics, here: https://petsvetcheck.de/fachbeitrag/magen-darm-probleme-beim-hund/