A 43-year-old female is admitted for evaluation of nausea, e…
A 43-year-old female is admitted for evaluation of nausea, emesis, ataxia, and dizziness. Previous medical history reveals HIV (+) status for 4 years with the most recent CD4 count of 100/mm3. Vital signs and neurologic examination are normal. MRI shows 2 ring-enhancing lesions of the basal ganglia, each approximately 1 cm in diameter. The patient is treated with sulfadiazine plus pyrimethamine and she is discharged following rehydration. Within 1 week, the patient’s symptoms improve and a second MRI 4 weeks later shows a significant reduction in the size of the lesions. Which of the following conditions is the most likely diagnosis for this patient?
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