天幕下脳膜腫について

MENINGIOMA IN POSTERIOR FOSSA

緒言

　脳膜腫は頭蓋内のあらゆる場所に発生しうるが，その好発部位は天幕上特に前方に多く，上矢状洞，中硬膜動静脈の周辺，脳神経の出入口，鎌状膜，蝶骨辺等であり，天幕及び天幕下に発生するものは少いと云われている^1）2）。又脳腫瘍中天幕下脳膜腫は診断上最も困難なものの一つである。桂外科教室に於て，38例の脳膜腫を経験したが，4例が天幕及び天幕下のものであつたのでその特徴を述べ私見を加える次第である。

The clinical diagnosis of meningioma in po-sterior fossa is often difficult. Though the patientes have always headache, other symp-toms of the meningioma in posterior fossa are very confusable for its diagnosis.

One might have some cases that ther is no cerebellar signs in spite of the great size of that tumor, that the chief complaint in only visual disturbance, only motor or sensory di-sturbance, otherwise that there are contrala-teral cerebellar symptoms. Though meningi-oma located in crebellopontine angle is apt to mistake with a acoutic neurinoma, the diffe-rent signs from the acoustic neurinoma will be developed in the meningioma in posterior fossa. Among 38 meningiomas experienced in our clinic, 4 cases were located in posteri-or fossa.

On this paper, authors reported the intere-sted courses of these cases and discussed them from the literatures about meningioma in po-sterior fossa.