Magnetic resonance imaging (MRI) of the brain of a woman in her thirties with word-finding difficulties, expressive aphasia and right arm weakness of 4-weeks' duration is shown (axial T2-weighted image). Testing for antibodies to HIV was positive, the white cell count was 2200 per cubic millimeter (44% neutrophils, 45% lymphocytes) and CD4 T-cells were 20 per cubic millimeter.
The most likely diagnosis is which of the following?
What is the diagnosis?
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