INTRODUCTION: Since the introduction of neuro endoscope in the last century, it was the mainstay treatment of hydrocephalus secondary to third ventricular cysts and tumors as craniopharyngiomas, pineal body tumors, and posterior fossa tumors. Preoperative MRI & MRA brain are mandatory to know the course of the posterior communicating arteries and to know the presence or absence of Liliequest membrane. ... Read more