Introduction. Intraventricular endoscopic surgery

hydrocephalus in adults comprises a diverse grouping of etiologies, pathophysiology, diagnostic criteria, and treatment needs involving the CSF pathways. Further, hydrocephalus is more common in adults than in children,1 and surgical procedures for hydrocephalus in adults in the US are annually performed almost five times more frequently than in pediatric patients.2 A previously described pragmatic, clinically oriented organizational scheme helps to ensure we distinguish four types of patients within the spectrum of adult hydrocephalus: 1) transitional patients (previously diagnosed with hydrocephalus and treated as children), 2) patients with previously unrecognized congenital hydrocephalus, 3) patients