Özet:
This report describes an obstructive hydrocephalus caused by the mass effect of a basilar artery aneurysm which is a rare condition. A giant multilobed aneurysm that developed in the high basilar tip causing hydrocephalus was treated successfully through clipping and lamina terminalis fenestration. The method of treating hydrocephalus caused by aneurysm is controversial. Ventriculoperitoneal shunt and endoscopic third ventriculostomy are among treatment options. Microsurgical clipping and lamina terminalis fenestration of a high basilar tip aneurysm causing hydrocephalus is a safe and effective method for treating both aneurysm and hydrocephalus in appropriate patients.