側脳室内乏突起膠腫—2例の報告と考察

Oligodendroglioma of Lateral Ventricle: Report of 2 cases and a review

I．はじめに

　Oligodendrogliomaの90％はテント上に，しかも主として大脳半球に発生する^14）．Martin^7）はこの大脳半球のoligodendrogliomaとやや異なった臨床的特徴をもち脳室を中心に発育したものをmidline groupとして一括し，以後midline oligodendroglioma, intraventri—cular oligodendroglioma^6）などの名称での報告が散見され，臨床的特異性が強調されている．われわれも最近2例の側脳室内oligodendrogliomaを経験したので，臨床的特徴，MRIを含めた画像診断，手術方法を中心に報告する．

Oligodendrogliomas rarely grow primarily in the ventricles. When compared to more common hemi-spheric counterparts, such intraventricular oligoden-drogliomas, or oligodenclrogliomas of the midline group (Martin), present distinct clinical features, namely, (1) they occur in the younger age, (2) an interval between clinical onset and diagnosis or oper-ation is shorter, and (3) initial symptoms are most often limited to those of increased intracranial pres-sure, although the patient may occasionally present mild organic dementia, callosal disconnection syn-drome, and/or mild gait ataxia.