6) Slit-Ventricle Syndrome
This syndrome occurs when the ventricles become extremely small, usually due to cerebrospinal fluid overdrainage. It occurs during early childhood or early adulthood. Symptoms include acute intermittent headache (typically lasting 10- 90 minutes, which diminishes when the patient lies down), ventricles smaller than normal as seen in imaging studies and the patients, however, may remain asymptomatic for a long period of time (Hydrocephalus Association, 2010).