10岁女，因发现第三脑室占位1月入院

CT:第三脑室内显示混杂密度肿块影，形态不规则，密度不均，见有分叶，大小约4.6×4.3CM。病灶周围未见明显水肿带，第三脑室及两侧脑室积水增大，中线结构左偏。

第三脑占位性病变（考虑为室管膜瘤）并脑积水，

图789是污染

Tumor tissue was not seen in these photos. No evidence to make a diagnosis of astrocytoma or ependymoma.

弥漫性星型细胞肿瘤

In this location, ependymoma (Clear cell type) and central neurocytoma should be in the top of ddx, immunostains should be helpful.Good luck.

少突胶质瘤？

弥漫性星形细胞肿瘤，I级。