World Neurosurg
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Case Reports
Third Ventricle Cavernous Malformation and Obstructive Hydrocephalus Thought to Be a Colloid Cyst.
Third ventricle cavernous malformations (CMs) associated with ventriculomegaly and obstructive hydrocephalus are quite rare in patients. Preoperative surgical planning can be challenging due to the lesion's non-specific appearance on CT and magnetic resonance imaging that can mimic other intraventricular pathologies, such as a colloid cyst. Management of these lesions can be varied in the setting of obstructive hydrocephalus. ⋯ A third ventricle CM was discovered after a neuroendoscopic approach for resection of a presumed colloid cyst in a patient with obstructive hydrocephalus. A neuroendoscopic septostomy was performed to treat the obstructive hydrocephalus and no resection was attempted. The patient suffered no complications and is at her neurologic baseline with no deficits.