Cerebral toxoplasmosis in a patient with the acquired immunodeficiency syndrome presenting as obstructive hydrocephalus.

We report the case of an adult AIDS-patient with an unusual pattern of toxoplasmic encephalitis resembling the congenital form of the disease. Extensive exudative ependymitis and plexitis caused obstruction of internal CSF-pathways with rapid development of hydrocephalus. CT showed hydrocephalus and multifocal hypodense non-enhancing lesions. Direct microscopy of the CSF demonstrated Toxoplasma organisms.