Benign Tumor of the Meninges in Dogs (Meningioma)
- Occurrence: rarer
- Location of disease: Head/Neck
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
A meningioma is a usually benign tumor that originates from the meninges, the protective membranes surrounding the brain and the spinal cord. In dogs, it is one of the most common brain tumors.
Das Wichtigste auf einen Blick
Meningiomas are tumors that arise from the cells of the arachnoid layer of the meninges in dogs. These tumors are often benign, but can exert pressure on the brain or the spinal cord and thereby lead to neurological symptoms such as seizures, behavioral changes, and movement disorders. The exact causes are unclear, but genetic factors and age could play a role; certain breeds such as Golden Retrievers, Boxers, and German Shepherds have a higher risk. The diagnosis is made through a clinical examination as well as through imaging procedures such as MRI or CT. In some cases, a biopsy may be necessary. Treatment depends on the tumor’s location and size and often includes surgical removal, radiation therapy, or drug treatment to relieve symptoms. The prognosis varies depending on the possibility of complete tumor removal and the response to other therapies. Prevention is difficult since the causes are not fully understood. Research is focusing on genetic factors, improved diagnostic methods, and new treatment options, including immunotherapy. These advances could improve treatment outcomes in the long term and may also be relevant for treatment in humans.
Ursachen
The meninges consist of three layers: the dura mater, the arachnoid, and the pia mater. These layers envelop the central nervous system (CNS) and provide protection as well as structural support. Meningiomas typically arise from the cells of the arachnoid, one of the middle membranes. These tumors are generally benign, but their location and potential growth can exert pressure on the brain or the spinal cord, leading to neurological symptoms.
The exact causes of meningioma development in dogs are not fully understood. It is believed that genetic factors may play a role in the development of these tumors. Certain breeds such as Golden Retrievers, Boxers, and German Shepherds appear to have an increased risk, which could indicate a genetic predisposition.
Radiation and environmental factors have also been investigated as possible risk factors, but there is currently no conclusive evidence directly linking these factors to the development of meningiomas. Some studies suggest that older dogs are more commonly affected, indicating that age may also play a role.
Symptoms
The symptoms of a meningioma in dogs can vary depending on the tumor’s location, size, and growth rate. Common signs include behavioral changes, such as increased aggression or apathy, as well as neurological symptoms such as seizures that occur in previously healthy dogs. Coordination disorders, tremors, or weakness of the limbs may also be observed.
Further symptoms can include Head shaking, Balance disorders, and a change in vision. In some cases, Vomiting or loss of appetite may occur, especially if the tumor affects intracranial pressure. Since the symptoms can be non-specific, an accurate diagnosis is important to rule out other neurological diseases.
Diagnose
The diagnosis of a meningioma typically begins with a thorough clinical examination, including a neurological assessment. The veterinarian will take the dog’s medical history and ask about specific symptoms. A blood test may be performed to rule out other conditions that could cause similar symptoms.
Diagnostic imaging is crucial for the diagnosis of meningiomas. Magnetic resonance imaging (MRI) or computed tomography (CT) of the brain can help locate the tumor and determine its size. These procedures provide detailed images of the brain and enable the veterinarian to distinguish the tumor from other possible causes of the symptoms.
In some cases, a biopsy may be necessary to make a definitive diagnosis. This involves taking a tissue sample of the tumor and examining it under a microscope to determine the type of tumor. However, this can be a risky procedure due to the tumor’s location.
Therapie
The treatment of meningiomas in dogs depends on various factors, including the tumor’s location and size, as well as the dog’s overall health. One of the most common treatment options is surgical removal of the tumor, especially if it is easily accessible. However, the surgery can be challenging and risky depending on the tumor’s location.
If complete removal is not possible, partial resection in combination with other therapies, such as radiation therapy, may be considered. Radiation therapy has proven effective in the treatment of meningiomas, especially when the tumor cannot be completely removed or if it recurs after surgery.
Drug therapy can also be used to relieve symptoms and slow tumor growth. Medications such as corticosteroids are frequently used to reduce inflammation and lower intracranial pressure. Anticonvulsants may be prescribed to control seizures.
Prognose und Nachsorge
The prognosis for dogs with meningiomas varies considerably and depends on several factors, including the possibility of complete surgical removal as well as the response to additional treatments such as radiation therapy. Dogs in whom complete tumor resection is possible generally have a better prognosis.
Even with successful treatment, however, meningiomas can recur. Follow-up care includes regular check-ups and, if necessary, further imaging procedures to monitor for tumor recurrence. The prognosis can also be influenced by the dog’s overall health and age.
Although meningiomas are benign in most cases, their location in the brain can cause life-threatening complications, which is why early diagnosis and treatment are crucial to improving the dog’s quality of life.
Prävention
Since the exact causes of meningiomas in dogs are not yet fully understood, there are no specific prevention measures against these tumors. However, general health monitoring and regular veterinary examinations can help detect signs of neurological problems early.
A healthy diet and regular exercise can promote the dog’s overall health. Minimizing environmental factors that may be associated with tumor growth could also be helpful, although further research is needed on this.
For dogs with genetic predisposition, genetic counseling may be useful to understand the risk of developing meningiomas. However, this is an area that still needs further research.
Ausblick auf aktuelle Forschung
Current research on meningiomas in dogs focuses on various aspects, including improving diagnosis methods, developing new therapy options, and understanding the biological basis of tumor formation. Scientists are striving to decipher the genetic and molecular mechanisms that lead to the development of meningiomas. These insights could lead to improved therapies specifically tailored to the individual genetic profiles of the tumors.
A promising area of research is the investigation of the role of gene mutations in the development of meningiomas. Studies have shown that certain genetic changes can promote tumor growth. Researchers are using modern techniques such as genome sequencing to identify specific mutations that occur frequently in affected dogs. This information could contribute to the development of targeted therapies in the future that address these genetic vulnerabilities.
Another important area of research is imaging technology. Advances in magnetic resonance imaging (MRI) and other imaging procedures have significantly improved the diagnosis of meningiomas. Researchers are working to further refine these technologies to enable even more accurate detection and characterization of tumors. This is crucial for determining the best treatment strategy for each individual case.
The development of new therapeutic approaches is also a focus of research. Traditionally, meningiomas were surgically removed, but this is not always possible or safe. Therefore, alternative treatment approaches are being investigated, including radiation therapy as well as medications that inhibit tumor growth. Various medications are being tested in clinical trials to evaluate their efficacy and safety in the treatment of meningiomas.
A forward-looking approach is immunotherapy, in which the dog’s immune system is stimulated to fight the tumor itself. Initial studies have shown that immunotherapies can be successful in other types of cancer, and researchers are now investigating whether they could also be effective in meningiomas. This type of therapy could be a promising alternative or complement to existing treatments.
In summary, research on meningiomas in dogs is dynamic and multifaceted. The combination of genetic studies, diagnostic imaging, and the development of new therapeutic approaches has the potential to significantly improve treatment outcomes in affected dogs. The hope is that these advances can ultimately also be applied to the treatment of meningiomas in humans.
Frequently Asked Questions (FAQs)
1. What is a meningioma?
2. How is a meningioma diagnosed in dogs?
3. What symptoms can occur in dogs with a meningioma?
4. What treatment options are available for meningiomas in dogs?
5. Is a complete cure of meningiomas possible in dogs?
6. How long can a dog with a meningioma live?
7. What risks are associated with the surgical removal of a meningioma?
8. Can a meningioma recur in dogs?
9. Are certain dog breeds more susceptible to meningiomas?
10. Can meningiomas be inherited in dogs?
Literatur
- Miller, A. D., Miller, C. R., & Rossmeisl, J. H. (2019). Canine primary intracranial cancer: A clinicopathologic and comparative review of glioma, meningioma, and choroid plexus tumors. Frontiers in Oncology, 9, Article 1151. https://doi.org/10.3389/fonc.2019.01151
- Belluco, S., Marano, G., Lurier, T., Avallone, G., Brachelente, C., Di Palma, S., Rasotto, R., Baiker, K., Beineke, A., Oevermann, A., Seehusen, F., de Sant’Ana, F. J. F., Boracchi, P., Pumarola, M., & Mandara, M. T. (2023). Standardization of canine meningioma grading: Validation of new guidelines for reproducible histopathologic criteria. Veterinary and Comparative Oncology, 21(4), 685–699. https://doi.org/10.1111/vco.12932
- Forward, A. K., Volk, H. A., Cherubini, G. B., Harcourt-Brown, T., Plessas, I. N., Garosi, L., & De Decker, S. (2022). Clinical presentation, diagnostic findings and outcome of dogs undergoing surgical resection for intracranial meningioma: 101 dogs. BMC Veterinary Research, 18, Article 88. https://doi.org/10.1186/s12917-022-03182-y
- Geiger, R., Mankin, J., Volk, H. A., de Decker, S., van Asselt, N., Randhawa, K., Ehling, T., Maitz, C. A., Naramor, A., Coates, J. R., Stalin, C., Johnstone, L., Morris, J., Plessas, I. N., Forward, A., Garosi, L., Scarpante, E., Cherubini, G., Harcourt-Brown, T., et al. (2025). Comparison of survival after treatment of presumed intracranial meningioma by radiotherapy or surgery in 285 dogs. Journal of Veterinary Internal Medicine, 39(2), Article e70011. https://doi.org/10.1111/jvim.70011
- Sturges, B. K., Dickinson, P. J., Bollen, A. W., Koblik, P. D., Kass, P. H., Kortz, G. D., Vernau, K. M., Knipe, M. F., LeCouteur, R. A., & Higgins, R. J. (2008). Magnetic resonance imaging and histological classification of intracranial meningiomas in 112 dogs. Journal of Veterinary Internal Medicine, 22(3), 586–595. https://doi.org/10.1111/j.1939-1676.2008.00042.x
- Keyerleber, M. A., McEntee, M. C., Farrelly, J., Thompson, M. S., Scrivani, P. V., & Dewey, C. W. (2015). Three-dimensional conformal radiation therapy alone or in combination with surgery for treatment of canine intracranial meningiomas. Veterinary and Comparative Oncology, 13(4), 385–397. https://doi.org/10.1111/vco.12054
- Axlund, T. W., McGlasson, M. L., & Smith, A. N. (2002). Surgery alone or in combination with radiation therapy for treatment of intracranial meningiomas in dogs: 31 cases (1989–2002). Journal of the American Veterinary Medical Association, 221(11), 1597–1600.