[BK virus encephalitis in an HIV-seropositive patient. Preliminary data].

The BK virus (BKV) belongs to the family of the polyoma group. Although up to 60% of AIDS patients excrete BKV in the urine, there have been few reports of infection of kidney, lung, retina, brain and peripheral blood mononuclear cells. We report the case of a 37 year-old male HIV positive patient with BKV encephalitis. This diagnosis should be considered in AIDS patients with signs of cerebral disease.