Antonio-Valdiviezo A, Gómez-Rivera S, Martínez-Torres J. Progressive multifocal leukoencephalopathy in a patient with prolonged survival: a case report. Rev Med Inst Mex Seguro Soc. 2021;46(5):557-560. Accessed November 12, 2026. https://revistamedica.imss.gob.mx/index.php/revista_medica/article/view/2708