Fig. 7

Diagrammatic illustration of three distinct imaging patterns of posterior reversible encephalopathic syndrome (PRES). a The classic occipitoparietal pattern is characterized by involvement of the parietal and occipital lobes (arrows) with variable involvement of the temporal lobes (arrowheads). b The holohemispheric watershed pattern is characterized by vasogenic edema in a linear pattern at watershed zones of the brain (arrows and stars). c The superior frontal sulcus pattern is characterized by varying degrees of involvement of the parietal and occipital lobes (arrows), associated with more isolated vasogenic edema of the mid to posterior aspect of the superior frontal gyri (arrow heads), sparing the frontal poles