Colloid Cyst in Cavum Septum Pellucidi: Rare Location and Endoscopic Removal

Colloid cysts are benign intracranial lesions, that account only 0.2-2% of intracranial lesions, mostly localized in the roof of the third ventricle. Although the cysts are histological benign, they sustain significant neurological presentation or death due to cerebrospinal fluid (CSF) obstruction and acute hydrocephalus. Cavum septi pellucidi, another pathology which can cause similar results, may be in a strategic position closer to the foramen monro. Colloid cysts outside the third ventricle are extremely rare. A colloid cyst in septum pellicidum location using panthpaque ventriculogram was first reported by Ciric. Although microsurgical resection with the use of either a transcallosal or transcortical-transventricular approach has been accepted, in recent years neuroendoscopic approaches are preferred for the treatment of these locations. This is a report of colloid cyst in cavum septi pellucidi which was successfully removed using endoscope.