Successful Endoscopic Third Ventriculostomy in the Presence of an Intraventricular Developmental Venous Anomaly: Case Report

Cerebral cavernous malformations are commonly associated with a developmental venous anomaly. Sparing this anomaly is considered important as it frequently is part of the venous drainage of normal brain parenchyma. We present a case in which a developmental venous anomaly of the third ventricle associated with a thalamic cavernous malformation increased the degree of difficulty of successful endoscopic third ventriculostomy for management of hydrocephalus. Through a conventional approach with careful pre-operative planning we were able to successfully fenestrate the floor of the third ventricle and spare the abnormal venous complex.