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Gamma knife radiosurgery-induced cavernous hemangioma: case report
Yasuo Sasagawa1, Takuya Akai, Shoutarou Itou
1Department of Neurosurgery, Tonami General Hospital, Tonami, Toyama, Japan. yacchan1218@yahoo.co.jp
Neurosurgery
|May 1, 2009
Summary
A rare case of radiation-induced cavernous hemangioma occurred 10 years after gamma knife radiosurgery for a vestibular schwannoma. Long-term patient follow-up is crucial after radiosurgery due to the potential for secondary neoplasms.
Area of Science:
- Neurology
- Neurosurgery
- Radiation Oncology
Background:
- Vestibular schwannomas are tumors that can be treated with gamma knife radiosurgery.
- Radiation-induced secondary neoplasms are rare but possible complications of such treatments.
Observation:
- A 35-year-old man developed new neurological symptoms 10 years post-radiosurgery for a vestibular schwannoma.
- MRI revealed a distinct lesion in the pons, separate from the original tumor site.
- Imaging characteristics, including "popcorn-like" T2 signal and hemosiderin rim, were consistent with cavernous hemangioma.
Findings:
- The secondary lesion was diagnosed as a radiation-induced cavernous hemangioma.
- The lesion appeared in an area that received a low radiation dose, distant from the primary tumor.
- Symptoms improved spontaneously without intervention.
Implications:
- Gamma knife radiosurgery can induce secondary cavernous hemangiomas, even in low-dose, distant areas.
- This case highlights the importance of long-term surveillance for patients undergoing radiosurgery.
- Awareness of this rare complication is essential for clinicians managing patients post-radiosurgery.