Keywords: CNS, central nervous system; CSF, cerebrospinal fluid; Cerebral toxoplasmosis; MMF, mycophenolate mofetil; MRI, magnetic resonance imaging; PML, progressive multifocal leukoencephalopathy; PV, pemphigus vulgaris; TMP-SMX, trimethoprim-sulfamethoxazole; pemphigus vulgaris; progressive multifocal leukoencephalopathy; rituximab.