Acute necrotizing encephalopathy with widespread edematous lesions of symmetrical distribution.

A 67-year-old Japanese woman with liver cirrhosis was affected by an unusual acute progressive encephalopathy, presenting mental confusion and slurred speech as its initial symptoms. She died in profound coma, following the entire course of 17 days. Autopsy disclosed bilateral symmetrical, widespread, edematous and necrotic lesions, their centers being located in the basal ganglia, diencephalon and midbrain, and their peripheries expanding into the cerebral white matter, cerebellum, pons and medulla. Diapedesis of erythrocytes and serum plasma was conspicuous, in contrast to paucity of capillary proliferation. Although the lesions were somewhat similar to those of Wernicke's and Leigh's encephalopathies, they were considered to be representative of a more acute metabolic disorder distinct from the latter conditions.