lesions involving the fourth ventricle included ependymoma ( three ) , subependymoma ( one ) , glioma ( five ) , cysticercosis cyst ( three ) , medulloblastoma ( three ) , bleeding into the fourth ventricle ( two ) , epidermoid cyst ( two ) , `` '' trapped '' '' fourth ventricle ( one ) , and lymphomatoid granuloma ( one ) .
C0017638
glioma
C0025149
medulloblastoma