上矢状洞不完全閉塞により頭蓋内圧亢進症状を呈した傍矢状洞髄膜腫の1例

Parasagittal meningioma growing in the superior sagittal sinus presenting intracranial hypertension:a case report

I．はじめに

　中1／3傍矢状洞髄膜腫は，運動感覚障害，部分てんかんで発症することが多く^2），頭蓋内圧亢進で発症することは少ない．また上矢状洞への浸潤は40％に認められるが^5），静脈洞内に主に進展しうっ血乳頭で発症する例は稀と考えられる．今回，上矢状洞内に主に進展しうっ血乳頭にて発症した症例を経験したので報告する．

Parasagittal meningiomas often invade the superior sagittal sinus (SSS), but rarely grow inside the SSS as a primary tumor. The authors report a case of para-sagittal meningioma growing mainly inside the SSS and presenting papilledema. The SSS is invisible be-hind the tumor end on the right carotid angiogram but still patent on the left carotid angiogram. The superfi-cial cortical vein on the opposite side works as a col-lateral pathway. The tumor may have originated from the right wall of the SSS, grew inside the sinus and co-vered the entrances of the right ascending cerebral veins. V-P shunt was performed after removal of the mass outside the sinus for resolving headache and visual symptoms.