Third nerve palsy as a presenting sign of acquired immune deficiency syndrome.

The case of a 29-year-old former parenteral drug abuser who presented with a 3rd nerve palsy and contralateral ataxia is reported. The patient was found to have a positive HLTV-III titer and acquired immune deficiency syndrome was diagnosed. Computed tomography demonstrated two ring-enhancing lesions in the brain which were presumed to be due to Toxoplasma gondii.