[Marchiafava-Bignami's disease with a favourable course. Apropos of a case].

A resolving form of Marchiafava-Bignami disease is reported. This patient with a history of chronic alcoholism was hospitalised for a recent demential syndrome. Clinical examination did not show any signs of interhemispheric disconnection LP and EEG were normal. CT examination showed a low density area in the corpus callosum without any other anomaly. MRI examination confirmed the cystic area of the corpus callosum. The Marchiafava-Bignami disease was easily suggested on the basis imaging and clinical signs. Interhemispheric disconnection is not always found so MRI and CT examinations seem to be very useful tools for early diagnosis of Marchiafava-Bignami in the same way as neuropsychological tests.