Forth ventricle的用法和样例：
例句
- Here is an ependymoma arising from the ependymal lining of the fourth ventricle above the brainstem and bulging toward the cerebellum.
发生在脑干之上第四脑室室管膜的室管膜瘤。 - MR images show a lesion involving the right second frontal convolution and another in the cerebellum, near the fourth ventricle, also visible on the sagittal imagemap.
磁共振示病变一处涉及右侧第二额回，另一处涉及小脑，接近第四脑室，在矢状面影像上也能看见。
