脑膜瘤是颅内最常见的肿瘤之一,发病率占颅内肿瘤的10%~20%,中年女性多见。脑膜瘤起源于中胚层结缔组织,发生在蛛网膜颗粒。好发部位包括上矢状窦旁、大脑镰旁、大脑凸面、幕切迹、前中后颅凹底和桥小脑角处。脑室内及三脑室后亦可发生。肿瘤多为单发,偶见多发。CT平扫见脑膜瘤 Meningioma is one of the most common intracranial tumors, the incidence of intracranial tumors accounted for 10% to 20%, more common in middle-aged women. Meningiomas originate from mesodermal connective tissue and occur in arachnoid granules. The predilection sites include the parasagittal sinus, falx parasite, cerebral convexity, curtain notch, anterior and posterior cranial fossa and cerebellopontine angle. Intracerebroventricular and third ventricle can occur. Tumors are mostly single, occasionally multiple. CT scan to see meningioma