第四脑室室管膜瘤(颅后窝、矢状面)

发生在脑干之上第四脑室室管膜的室管膜瘤。 组织学上，室管膜瘤是良性肿瘤。

Here is an ependymoma arising from the ependymal lining of the fourth ventricle above the brainstem and bulging toward the cerebellum. Ependymomas are benign histologically.