Fig. 3From: Idiopathic fourth ventricle outlet obstruction successfully treated by endoscopic third ventriculostomy: a case reportIntraoperative view of the foramina of Magendie (a) and Luschka (b) via neuroendoscopy. Membranous lesions (arrow) covering both foramina suggested the blockage of CSF flow in the fourth ventricle outletsBack to article page