[Description of a case of multiple sclerosis with psychotic disorders at the onset].

The authors report on the case of a woman, aged 29, who was suffering for 15 years from an unipolar manic psychosis and for 5 years from ataxia, speech troubles and urine incontinence. The diagnosis of MS was supported by the presence of a marked increase of liquoral IgG as well as Link's and Tourtelotte's index. CT scan, EEG and VEPs were normal. The relationships between the two clinical conditions are briefly discussed on the view of data of the literature.