Vasogenic cerebral edema
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Vasogenic cerebral edema refers to a type of cerebral edema in which the blood brain barrier (BBB) is disrupted (cf. cytotoxic cerebral edema, where the blood-brain barrier remains intact). It is an extracellular edema which mainly affects the white matter via leakage of fluid from capillaries.
The causes are diverse, including neoplasm, infection, inflammation, hemorrhage, subacute arterial infarct, and venous infarct4.
If the edema is bilateral and more widespread in particular then posterior reversible encephalopathy syndrome (PRES) should also be considered.
grey-white matter differentiation is maintained and the edema involves mainly white matter, extending in a finger-like fashion
hyperintense T2 and FLAIR signals, which do not show restricted diffusion 2 (cf. cytotoxic cerebral edema, which shows diffusion restriction)