TY - JOUR T1 - MR imaging in progressive multifocal leukoencephalopathy. JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 1033 LP - 1035 VL - 7 IS - 6 AU - M H Guilleux AU - R E Steiner AU - I R Young Y1 - 1986/11/01 UR - http://www.ajnr.org/content/7/6/1033.abstract N2 - The MR imaging appearance of progressive multifocal leukoencephalopathy is described in four cases that were confirmed by brain biopsy. Characteristic aspects are long T1 and long T2 lesions limited to white matter. At first the lesions are round or oval, then confluent and large. There is no mass effect. The involvement is most often asymmetric and distant from the periventricular region. The differential diagnosis includes other diseases affecting white matter: demyelination, infarction, infection, and tumors. ER -