| 1. | Differential diagnosis included cerebral toxoplasmosis , cytomegalovirus ( cmv ) encephalitis , primary cns lymphoma , progressive multifocal leukoencephalopathy , fungal abcess due to candida , aspergillus , or cryptococcus , varicella - zoster virus encephalitis or vasculitis , herpes simplex encephalitis , tuberculosis ( m . tuberculosis ) , and kaposi ' s sarcoma
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