Here we report the challenging case of a 41-year-old man with HIV complicated by AIDS and a history of prior neurologic injury from progressive multifocal leukoencephalopathy who presented with headache, fevers, lower extremity weakness, hyperreflexic upper extremities, and diminished lower extremity reflexes. We review the clinical decision-making and differential diagnosis for this presentation as the physical examination evolved and diagnostic testing changed over time.
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