2.
You are working in a human immunodeficiency virus (HIV) clinic, providing psychiatric care to acquired immunodeficiency syndrome (AIDS) patients. One patient whom you are treating has exhibited a change in his level of alertness, confusion, headache, fever, and focal neurological signs. You obtain a computed tomography (CT) scan, which shows multiple bilateral, ring-enhancing lesions in the basal ganglia. What is the most likely medical diagnosis for this patient?