Posterior reversible encephalopathy syndrome (PRES)

Characteristic imaging pattern in PRES is the presence of edema involving the white matter of the posterior portions of both cerebral hemispheres, especially the parieto-occipital regions, in a relatively symmetric pattern that spares the calcarine and paramedian parts of the occipital lobes. Recently, studies with diffusion-weighted sequenceshave shown increased apparent diffusion coefficients (ADCs) in the involved regions which suggests reversible vasogenic edema as an underlying pathophysiology. This is a 7 year old girl with classical MRI findings

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