[Coma caused by meningoencephalitis as the initial manifestation of infectious mononucleosis. Description of a case].

The clinical, anatomopathological and electroencephalographic aspects of C.N.S. impairment during I.M. are examined. The comparative frequency of such involvement, which generally presents in benign form, is confirmed together with the possible onset of forms that are extremely serious in terms of their course and prognosis. A case of I.M. which began with meningo-encephalitis-induced coma is reported. Stress is laid on the need to allow for mononucleosis infection when in the presence of viral encephalitis of unknown aetiology.