normal pressure hydrocephalus [L, norma, rule, premere, to press; Gk, hydor, water, kephale, head] , a condition in which there is dilation of the ventricles without an increase in intracranial pressure. Classic symptoms are gait disturbance, memory/cognitive problems, and urinary incontinence. Diagnosis is made by lumbar puncture to remove cerebrospinal fluid and by watching to see if any of the symptoms improve.
