脳室内出血をきたした側脳室内髄膜腫の1例

A case of lateral ventricular meningioma presenting with intraventricular hemorrhage

髄膜腫の出血の頻度に関しては1.3～2.4％程度であるとの報告がみられる^1）。そのうち，側脳室内出血をきたす髄膜種はまれである^2）。今回我々は脳室内出血をきたした側脳室内髄膜腫の1例を経験したので，文献的考察とともに報告する。

A 50-year-old woman presented with a sudden onset of right-sided headache and repeated vomiting. Head CT and MRI showed a right lateral ventricular mass with intraventricular hemorrhage. The mass showed homogenous enhancement. After gross total resection, the mass was diagnosed as transitional meningioma. This case suggests that grade 1 meningioma can bleed outside the tumor. We think it is difficult to distinguish intraventricular meningioma with hemorrhage from solitary metastasis to the choroid plexus.