An unusual cause of bilateral mental neuropathy in an AIDS patient. Report of a case.

A case is reported of a patient with sudden onset, generalized toothache accompanied with a numb chin and lower lip. A thorough oral examination was negative. A complete medical evaluation revealed a positive HTLV-III antibody titer and acute lymphoblastic leukemia (Burkitt's-type). An unexplained trigeminal neuropathy should prompt the dentist to refer the patient for complete medical evaluation. A high index of suspicion of a malignant process should be maintained in all cases of unexplained numb lower lip and/or chin.

Differential diagnosis of palinacousis in a psychiatric patient.

Palinacousis is a relatively rare neurological phenomenon that may be misdiagnosed in psychiatric patients if it is not differentiated from the auditory hallucinations of psychotic illness. The authors present a case of palinacousis that responded to phenytoin.