Case #57

CT

• Extensive vasogenic edema in the left greater than right cerebral hemispheres with a posterior predominance
• Associated mass effect with crowding of the left lateral ventricle and slight left-to-right midline shift
• No evidence of downward transtentorial herniation or hydrocephalus

MRI

• Focus of restricted diffusion in the left frontal periventricular white matter, consistent with an acute/early subacute ischemic infarct
• Extensive T2/FLAIR signal hyperintensity in the left greater than right cerebral white matter with a posterior predominance. Additional involvement of the left parietal cortex
• Numerous intermixed foci of parenchymal susceptibility artifact in a predominantly lobar distribution with relative sparing of the deep gray structures
• No corresponding enhancement