Magnetic resonance imaging of the brain for altered mental status. Multiplanar/multisequence MRI of the brain was performed with and without intravenous contrast using the standard departmental protocol and findings of diffuse central volume loss without focal intracranial mass, hemorrhage, hydrocephalus, restricted diffusion, or abnormal enhancement. Patent flow demonstrated in cavernous carotid arteries, basilar artery, and superior sagittal sinus.