A rare bleeding problem after gamma knife treatment for an ear nerve tumor
Original title: Radiation-induced cavernous malformation arising within vestibular schwannoma manifesting as subarachnoid hemorrhage: Case report and literature review.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was tested in people. That is the most reliable kind of research we share.
This is a report of one patient plus a look back at past cases, not a new treatment.
The short version
Doctors report one woman who had serious bleeding inside a benign ear nerve tumor two years after radiation treatment.
What was studied. This is a report about one patient. A 65-year-old woman had gamma knife radiosurgery for a vestibular schwannoma, a benign tumor on the nerve between the ear and the brain. The doctors also looked back at the few similar cases that have been reported before.
What they found. Two years after the radiation, a tangle of abnormal blood vessels formed inside her tumor. She first had mild facial weakness. Six days later she came in with a sudden severe headache, facial and eye muscle paralysis, and deafness. Scans showed bleeding around the brain and inside the tumor. Surgeons removed the tumor three weeks later, but her symptoms did not go away. Looking at past reports, the doctors found bleeding happened in 80% of these cases inside this type of tumor, compared with about 20% when these vessel tangles form elsewhere in the brain.
What this means, and what it doesn't
What it could mean: If you have had gamma knife radiation for this kind of tumor, this problem is possible but very rare. Only four other cases have been reported. It suggests that long term check ups after radiation are worth keeping. New facial weakness or a sudden severe headache after this treatment is worth telling your doctor about right away.
What it doesn't mean: This is not a new treatment, and it is not a cure for anything. It is a report of what happened to one person, plus a look back at a handful of past cases. A small number of cases cannot tell us how often this really happens or who is at risk. It does not mean gamma knife radiation is unsafe or that you should change your care. Talk with your own doctor before making any decisions.
Source: PubMed, July 24, 2026 · Read the original
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