the hydrocephalus subjects fell into two categories : patients with recent-onset obstructive hydrocephalus and symptoms of raised intracranial pressure due to obstruction of cerebrospinal fluid ( csf ) drainage by posterior fossa or third ventricular cerebral tumours , and patients with hydrocephalus of more insidious onset that was associated either with congenital abnormalities , or which was idiopathic .
C0549423
obstructive
C0020255
hydrocephalus