Fact-sheet: Anoxic encephalopathy
Updated on 09/17/2021 at 12:16 PM
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Definition
Encephalitis secondary to anoxia or a prolonged ischemic episode
CT
Loss of gray-white matter differentiation,
white matter hypodensity,
effacement of cortical sulci
MRI
In the acute phase: T2 FSE and T2 FLAIR: hyperintensity of the basal ganglia and cerebral cortex, with sparing of the white matter. Diffusion: hyperintensity with decreased ADC in the basal ganglia and cerebral cortex. T1 gado: possible enhancement of the basal ganglia and cerebral cortex. Perfusion: hypoperfusion of the basal ganglia and cerebral cortex. In the chronic (sequelae) phase: cortico-subcortical atrophy with dilation of the ventricular system, evidence of Wallerian degeneration, increased ADC on diffusion imaging
