Eclamptic encephalopathy: imaging and pathogenetic considerations.

Eclampsia is a rare condition peculiar to pregnant and puerperal women, characterized by clinical pre-eclampsia (hypertension, proteinuria, edema) and generalized seizures. Three cases of eclamptic encephalopathy are reported: CT and MRI demonstrated transient abnormalities in the cortical and subcortical regions of the posterior areas of the brain - namely, parieto-occipital lobes - associated with occasional involvement of basal ganglia and/or brainstem. Pathogenesis is still unclear. Strict similarity with the pathological findings characterizing hypertensive encephalopathy suggests that a focal impairment in cerebral autoregulation may be the cause of vasodilation and fluid extravasation leading to hydrostatic edema; selective involvement of posterior areas could be explained by their lesser degree of adrenergic innervation supporting circulatory autoregulation mechanisms.