Meningioma in dogs: treatment, prognosis and clinical trials
Dogs · USA & Canada
Understanding meningioma
Meningioma arises from the membranes surrounding the brain or spinal cord. Many grow relatively slowly, but they can still cause major neurologic problems by compressing normal tissue. Location, surgical accessibility and the dog’s neurologic condition are often more important than growth rate alone.
What does the prognosis look like?
Meaningful control is often possible. In a 2025 multicenter study, the typical survival time was about 23 months in the radiation group and about 10 months in the surgery group. The dogs selected for those treatments were different, and the figures are not clocks beginning on the treatment date or proof that radiation is superior. Tumor location, neurologic condition and whether effective local control is possible determine which outlook is realistic.
What matters next
Stabilize seizures or other neurologic problems, then use the MRI to discuss whether the tumor is safely accessible and whether surgery, radiation or both make sense for this dog. Location and neurologic condition matter more than simply asking whether a meningioma can be removed in general.
Where are you now?
My dog is having seizures or other neurologic signs
Control symptoms while the definitive plan is arranged. Worsening seizures, inability to walk, severe disorientation, or rapidly changing neurologic signs can justify earlier reassessment.
Surgery has already been done
Review the pathology grade when available and whether residual tumor remains on postoperative imaging. Radiation may be discussed for incomplete removal, recurrence, or higher-risk pathology.
The tumor cannot be removed safely
Definitive or stereotactic radiation can provide meaningful control in selected dogs. Ask what outcome is realistic for this location and whether tissue confirmation is necessary before treatment.
If you are waiting for oncology
Neurologic stability matters more than waiting for a preferred appointment. Keep seizures and other symptoms controlled, obtain a good MRI review, and compare surgery with radiation based on location rather than assuming one is automatically superior.
Questions to ask your oncologist
- Is this tumor surgically accessible, and what morbidity would surgery carry?
- Would radiation offer comparable control for this location?
- Do we need tissue confirmation, and would the answer change treatment or trial access?
How the diagnosis may appear in the record
MRI often strongly suggests meningioma, but pathology after surgery supplies the definitive type and grade. The useful record includes tumor location, relationship to critical structures, edema, whether removal was complete, and any residual tumor on postoperative imaging.
Changes to watch for at home
Track seizures, behavior, vision, balance, walking, appetite, and medication changes. A prolonged seizure, repeated seizures without recovery, rapidly worsening awareness, or sudden inability to stand needs urgent assessment.
How it is usually treated
Surgery, radiation or a combination can provide meaningful local control. Surgery is best suited to tumors that are safely accessible, while radiation is often chosen when surgery is not feasible, incomplete or not preferred. Medications help control seizures and inflammation but do not remove or shrink the tumor by themselves.
What can affect treatment choices
Location, surgical accessibility, neurologic condition, residual disease after surgery, recurrence and anesthesia risk determine whether surgery, radiation or both are reasonable.
Tests that may matter
MRI is the main planning test because it defines location, size and relationship to nearby brain structures. Tissue diagnosis and grade are obtained if surgery or biopsy is performed. Additional testing is useful only when it changes surgical, radiation or trial planning.