(A) Axial T2-weighted image at level of lateral ventricles in a patient with Alzheimer disease demonstrates increased size of the ventricular system in proportion to sulcal dilatation, consistent with brain parenchymal volume loss. (B) Axial T2-weighted image at level of lateral ventricles in a patient with NPH shows ventricular dilatation out of proportion to the sulci.
MRI: magnetic resonance imaging; NPH: normal pressure hydrocephalus.
