Neuroimaging of Adult Hydrocephalus.

Ventricle expansion and disproportionately enlarged subarachnoid-space hydrocephalus (DESH) are the hallmark features of idiopathic normal-pressure hydrocephalus, which has recently also been referred to as Hakim's disease. DESH refers to the unbalanced distribution of CSF in the subarachnoid space characterized by tightened sulci in the high convexities and Sylvian fissure dilation. The ventricles and Sylvian fissure expand in the parietal direction. This process compresses the brain and subarachnoid space around the parietal region. In addition to 2-dimensional imaging indicators, this study describes new 3-dimensional and 4-dimensional imaging indicators.