Changes in the volumes of the brain and cerebrospinal fluid spaces after shunt surgery in idiopathic normal-pressure hydrocephalus

The volumes of the cerebral hemisphere and infratentorial brain did not change significantly after shunt surgery (p = 0.231, 0.109, respectively). The volumes of the ventricles and infrasylvian subarachnoid CSF spaces were significantly decreased (p < 0.0001, < 0.05, respectively), with a mean change rate of −26.1% and −4.5%, respectively. The volumes of the suprasylvian subarachnoid CSF spaces increased significantly (p < 0.0001), with a mean change rate of 43.5%. The decrease in ventricular volumes was significantly correlated with clinical improvement.