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Saccular Aneurysm of Internal Jugular Vein in a Young Patient.

stain. Generally, tentorial CAs could be supplied by feeders such as meningeal branches of vertebro-basilar arteries and branches of external carotid arteries. The present case showed almost the same findings as those in the tentorial CAs described previously, except for spontaneous hemorrhage; however, preoperatively, we misdiagnosed it as a hypervascular brain tumor, such as a meningioma or hemangiopericytoma. Hence, although rare, in the differential diagnosis of tentorium-based tumors, including meningiomas and hemangiopericytomas, tentorial CA should be considered. The treatment of choice for tentorial CAs is total surgical removal. Preoperative embolization of the feeders was suggested for maximum safe resection with minimal blood loss. In addition, as intracranial extra-axial CAs are more radiosensitive than intraaxial CAs, in patients of a partial removal or biopsy with histological confirmation, radiotherapy is recommended as it could obtain a marked shrinkage of the tumor. In conclusion, although extremely rare, tentorial CAs could present with spontaneous hemorrhage, and they might be easily misdiagnosed as other tentorium-based hypervascular brain tumors. Preoperative embolization of the feeders was suggested for maximum safe resection with minimal blood loss. In patient of partial removal, radiotherapy is effective to shrink the tumor.