[Acute transient Korsakoff's syndrome caused by hematoma of the floor of the 3rd ventricle].

A forty four year-old woman had had an amenorrhea-galactorrhea syndrome for 3 months when a Korsakoff's syndrome with headache suddenly appeared. Neuroradiological investigations revealed a hematoma involving the anterior part of the IIIrd ventricle. After a short period of neurogenic hypernatremia the lesion disappeared with the development of a spontaneous ventriculocisternostomy. Simultaneously, the Korsakoff's syndrome decreased until it went off almost completely, but a diabetes insipidus appeared and the hyperprolactinemia remained unchanged. Four years later, those are the only symptoms which are still present. This case, particular by its aetiology and evolution, illustrates well the possibility of functional Korsakoff's syndromes.