A 47-year-old man with a recent diagnosis of AIDS and diffuse large B-cell lymphoma was hospitalized because of seizures and an enlarging left neck mass. MRI of the brain showed a 2.5 by 1.2 cm lesion in the left inferior parietal lobe, a 1.4 by 0.7 cm ring-enhancing lesion in the right frontal lobe, and other scattered bilateral lesions. A craniotomy was done, and biopsies obtained from the right temple lesion for aerobic, anaerobic, fungal, and mycobacterial cultures, polymerase chain reaction for Toxoplasma, and surgical pathology.
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