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Weber's syndrome due to a possible solitary brainstem toxoplasmosis as a presenting sign of AIDS

We report the case of a young man, with a previous history of parenteral drug abuse, who developed a Weber's syndrome. Brain computed tomographic scan and nuclear magnetic resonance imaging showed a single ring enhancing lesion in the right mesencephalic site. After the demonstration of seropositivity for human immunodeficiency vims, a presumptive diagnosis of cerebral toxoplasmosis in an AIDS patient was made and a specific treatment was started. A partial neuroradiological and clinical improvement were obtained. Opportunistic cerebral lesions, as first manifestation of AIDS, should be always considered in subjects at risk for AIDS who present a brainstem syndrome.