Fig. 3From: Simultaneous biportal endoscopic management of pineal region tumors in patients with obstructive hydrocephalus: technical notesA, B Operative view through the second endoscope while advancing the first one into foramen of monro. C–F Operative view through the first ventriculoscope. C Floor of 3rd ventricle. D Endoscopic forceps performing the ostium. E The ventriculostomy opening. F Liliequist membrane after openingBack to article page