Cerebellitis in infectious mononucleosis.

To the Editor.— Infectious mononucleosis may be related to infection with the EB virus, and involves many organ systems. Although not common, involvement of the central nervous system (CNS) has included alterations of consciousness, seizure, transient hemiparesis, cranial nerve involvement, and meningoencephalitis. One large review of CNS involvement listed 12 examples among a total of 1,285 cases.1We report one of the more rare CNS manifestations, acute cerebellitis. Report of a Case.— A 15-year-old boy was well until he was knocked unconscious in a fight one month prior to his admission to the hospital. He remained unconscious from four to five minutes and upon recovery had a posttraumatic amnesia of ten minutes' duration. He was then well until a severe sore throat and myalgia developed one week prior to admission. This was treated with penicillin administered orally. He felt better, but four days later upon awakening his gait was