Progressive multifocal leukoencephalopathy (PML), a slowly progressive papovavirus infection of the central nervous system (CNS), has been reported in more than 110 patients to date, over half of whom have had either leukemia or lymphoma.1-13 Only occasionally has no obvious underlying immune-altering disorder been noted.1,2 To our knowledge, only three patients have been reported previously to have developed PML after long-term immunosuppression for renal transplantation5,12,13; the patient discussed here is the fourth. Our patient also demonstrated unilateral parkinsonian signs attributable to involvement of the extrapyramidal motor system. Parkinsonism has been a very unusual clinical manifestation of PML, and has been reported previously in only one patient.14 We believe that PML is emerging as a potentially serious problem in renal transplant recipients.
A 34-year-old man who had had multiple admissions for chronic renal failure and hypertension caused by chronic proliferative glomerulonephritis had both kidneys (and
McCormick WF, Schochet SS, Sarles HE, Calverley JR. Progressive Multifocal Leukoencephalopathy in Renal Transplant Recipients. Arch Intern Med. 1976;136(7):829-834. doi:10.1001/archinte.1976.03630070067020