Review of posterior reversible encephalopathy syndrome.

Posterior reversible encephalopathy symdrome is the syndrome characterized by headache,seizures,confusion,visual disturbances.The exact etiology and mechanism remain unclear.The spectrum of associated diseases is diverse,including acute rise in blood pressure,eclampsia,various renal disease and renal failure,connective tissue disease,immunosuppressive or cytotoxic medication are associated with PRES.The mechanisms included breakdown of cerebral perfusion pressure,damage of vascular endothelial cell,and so on.Typical radiological findings are bilateral symmetric,multifocal lesion distributed in posterior regions of the cerebral hemisphere.Treatment includes decreasing cerebral edema,antiepileptic drugs,decreasing blood pressure.Generally,it is reversible and benign.