Home » Diseases » In cats » Schwannoma (nerve sheath tumor)

Schwannoma (nerve sheath tumor) in cats

Occurrence: very rare
Location of illness: General/Whole body, Head/Neck, Legs

Author: Dr. med. vet. Gisa Löwe | Last modified: 03.12.2025

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

A schwannoma, also known as a nerve sheathA nerve sheath is a protective covering around nerve fibers, made of myelin, that insulates electrical impulses and enables the rapid transmission of nerve signals. Damage to the nerve sheath can lead to neurological disorders in animals. 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 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 Schwann cells, which form the sheaths around peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nerves. These tumors are generally 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., but can cause symptoms due to their location and size.

The most important facts at a glance

A schwannoma is a 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 Schwann cells, which normally protect and insulate nerve fibers in the peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nervous system. The exact cause of schwannomas in cats is unclear, but genetic factors and environmental influences such as chemicals or radiation could contribute to their development. Symptoms include Lameness, muscle wasting, uncoordinated gait, and in rarer cases, facial 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 eye problems. A comprehensive neurological examination is performed 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., often followed by imaging procedures such as MRI. 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. may be necessary to confirm 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.. Treatment depends 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. size and location and often involves surgical removal, possibly accompanied by 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.. Conservative monitoring may be considered in certain cases.

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. varies but is usually positive 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. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult because the causes are not fully understood, but regular veterinary examinations and a healthy lifestyle can help reduce the overall risk of Tumors. Research into schwannomas in cats is still in its early stages but focuses on genetic and molecular bases, as well as non-invasive diagnostic procedures and new therapeutic approaches. Advances in these areas could improve treatment options in the future.

Causes

Schwann cells are specialized cells that form a protective and insulating sheath around nerve fibers in the peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nervous system. These sheaths are known as myelin sheaths, which increase the speed of electrical impulses along the nerves. A schwannoma develops when these Schwann cells divide uncontrollably, leading 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.

Although the exact causes for the development of schwannomas in cats are not yet fully understood, there are some factors that can contribute to their development. Genetic predispositions play a role, where mutations in certain genes that regulate cell growth and division can promote uncontrolled cell proliferation. Changes in genes responsible for cell cycle regulation can also lead 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.

Furthermore, environmental factors such as exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to certain chemicals or radiation can play a role. It is believed that such exposures can cause 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 in cells, which promotes the growth of schwannomas. Despite these findings, 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. often remains unclear, which complicates 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. and treatment of these tumors.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of a schwannoma in cats depend heavily on 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.. Since schwannomas occur near nerves, they can exert pressure on them, which can lead to various neurological symptoms. Common signs include Lameness, weakness, or 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. in the affected limbs, depending on which nerve is affected.

Cats may also show Pain, tremors, or Muscle twitching 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. exerts pressure on or irritates a nerve. In some cases, a schwannoma can impair the cat’s balance or coordination, leading to Stumbling or difficulty walking.

Further symptoms may vary depending on the 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.. 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. occurs near the spine, back or Neck pain, as well as difficulty moving the head, may occur. With tumors near sensorySensory refers to the senses or perception. Sensory systems in dogs and cats include sight, hearing, smell, taste, and touch, all of which are central to interacting with their environment. nerves, changes in vision or hearing may also be observed.

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 schwannoma in cats usually begins with a thorough clinical examination by a veterinarian. This includes a neurological assessment to evaluate nerve function and the potential effects 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. on the nervous system.

Imaging techniques such as X-rays, 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 MRI (Magnetic Resonance Imaging) are used to determine the exact 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.. MRI is particularly helpful as it provides detailed images of soft tissues, thus allowing for an accurate representation 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 its relationship to surrounding structures.

In some cases, 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. may be necessary to make 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.. A tissue sample 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. is taken and histopathologically examined to determine the type of cells and the presence of cancerous features. This examination helps 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 schwannoma and rule out other 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. 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. types.

Therapy

The treatment of schwannomas in cats depends on the size, location, and associated symptoms 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 many cases, 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. is the preferred method, 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. is easily accessible and the surgery carries no significant risks.

During surgery, 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 removed while attempting to spare the surrounding nerve structures. 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 deeply embedded in the nerves or if surgery carries significant risks, partial removal may be considered to alleviate symptoms.

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 a complementary treatment, 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. cannot be completely removed or if there is a high risk of recurrence. 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 help destroy residual 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. tissue and control growth.

In certain cases, especially in older cats or 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. does not cause severe symptoms, conservative monitoring may be considered. This involves regular check-ups to monitor 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 respond to changes promptly.

Prognosis and follow-up care

The prognosis for cats with schwannoma depends on several factors, including the complete 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., its location, and the cat’s general health. 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. schwannomas that can be completely removed generally have a good 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., and many cats recover completely without long-term effects.

However, 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. cannot be completely removed or if it is located in a critical area, 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. may vary. In such cases, remaining 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. cells can lead to regrowth, which may require further treatment.

Prevention

The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of schwannomas in cats is challenging because the exact causes for the development of these Tumors are not fully understood. Nevertheless, there are some general measures that can help minimize the risk. A balanced diet and regular veterinary check-ups are crucial to support the cat’s overall health. Regular check-ups can help detect and treat health problems early.

It is also important to keep the cat in a safe environment to avoid injuries that could potentially affect the nervous system. Minimizing stress and promoting an active lifestyle can also contribute to better overall health.

For breeders, it may be useful to consider the genetic 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. of the animals to reduce the risk of inheriting diseases. Although schwannomas are rarely inherited, responsible breeding practices can help reduce the overall risk of genetically determined diseases.

Overall, the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of schwannomas in cats is not specific, but by promoting a healthy lifestyle and regular veterinary care, the overall risk of 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. diseases can be reduced.

Outlook on current research

Research on schwannomas in cats is still in its early stages, as these tumors occur relatively rarely. Scientists are focusing on better understanding the genetic and molecular basis of these tumors. In particular, research is being conducted into which genetic mutations contribute to the development of schwannomas and how these may differ from schwannomas known in humans. A better understanding of genetic factors could lead to more precise diagnostic methods and targeted therapeutic approaches.

Another important research area is the development of non-invasive diagnostic procedures. Currently, imaging techniques such as MRI or CT are the main methods for 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 schwannomas. Researchers are working to improve these technologies to detect smaller tumors early and 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., without requiring 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. biopsies.

Therapeutically, new approaches such as targeted therapies and immunotherapies are being investigated. Targeted therapies could target specific genetic mutations in 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., while immunotherapies aim to strengthen the cat’s 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. to combat 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. more effectively. 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 show promising results, however, further research is necessary to confirm the safety and efficacy of these treatments in cats.

Research into the quality of life and long-term survival of cats with schwannomas is also a central aspect of current research. Long-term studies help to better understand 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. and improve treatment decisions. Researchers are evaluating how different treatment strategies affect the survival and quality of life of affected cats.

Overall, research into schwannomas in cats is a dynamic and continuously growing field. Advances in genetic research and the development of new therapeutic approaches promise to significantly improve 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. and treatment of these tumors in the future. Collaboration between veterinarians and researchers from related fields is crucial to gain new insights and integrate them into clinical practice.

Frequently asked questions (FAQs)

What is a Schwannoma? A schwannoma 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 Schwann cells, which form the myelin sheathThe myelin sheath is a fatty layer that surrounds and insulates nerve fibers. It enables rapid transmission of electrical signals along the nervous system. Damage to the myelin sheath can lead to neurological disorders. of peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nerves. In cats, schwannomas are rare and can be located in various body areas.
How do you recognize a schwannoma in cats? Schwannomas can be difficult to recognize because they often do not cause specific symptoms. They are often discovered incidentally during examinations or when their size causes them to press on other structures and cause symptoms, such as lameness or neurological deficits.
What treatment options are available for cats with a schwannoma? The most common treatment method for schwannomas is surgical removal. In some cases, additional treatments such as 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. or 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. may be considered, 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. cannot be completely removed or shows signs 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..
Can a schwannoma in cats 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.? Schwannomas are usually 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., but in rare cases, they can 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. and spread to other parts of the body. Such 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. forms are referred to as 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. peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nerve sheathA nerve sheath is a protective covering around nerve fibers, made of myelin, that insulates electrical impulses and enables the rapid transmission of nerve signals. Damage to the nerve sheath can lead to neurological disorders in animals. tumors.
How is a schwannoma diagnosed? 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 schwannoma is typically made through imaging procedures such as 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., 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., MRI, or CT, followed 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 microscopically examine the cells and confirm 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..
Are there preventive measures against schwannomas in cats? Since the exact causes of schwannomas are not fully understood, there are no specific preventive measures. However, general good care and regular veterinary check-ups can help to detect health problems early.
How common are schwannomas in cats? Schwannomas are relatively rare in cats compared to other types of tumors. They occur more frequently in older cats, although they can appear at any age.
What symptoms indicate a schwannoma? The symptoms of a schwannoma depend on its location. They can range from subtle symptoms to clear signs such as Pain, Lameness, Swelling, or neurological deficits. If a 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 suspected, a veterinarian should be consulted.
What 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. for cats with a schwannoma? 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 various factors, including the 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., whether it can be completely removed, and whether there are signs 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.. 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. schwannomas that are completely removed generally have a good 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..
What should I do if my cat has a schwannoma? If your cat has been diagnosed with a schwannoma, you should work closely with your veterinarian to develop the best treatment strategy. This may include a combination of surgical removal, monitoring, and possibly complementary treatments.