Basal ganglia calcifications: on head CT, suggestive of pediatric HIV infection

Brain atrophy: generalized, in an 8-year-old HIV-infected boy

Cryptococcal meningitis

Encephalopathy: severe

Facial palsy: left side of an HIV-infected woman

Non-Hodgkin lymphoma: CT scan of head

Progressive multifocal leukoencephalopathy

Toxoplasma gondii: CT scan showing cerebral abscess