title: Progressive multifocal leukoencephalopathy presenting as focal mass lesion in the brain.
abstract: Progressive multifocal leukoencephalopathy is a rapidly progressive patchy, demyelinating process seen in patients with a long standing reticuloendothelial disorder. The first instance of abnormal angiographic features of this entity simulating a neoplasm is presented.
mesh_terms: D001932:Brain Neoplasms / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography; D003937:Diagnosis, Differential; D005260:Female; D005625:Frontal Lobe / Q000473:pathology; D006801:Humans; D007968:Leukoencephalopathy, Progressive Multifocal / Q000000981:diagnostic imaging* / Q000382:microbiology / Q000473:pathology; D008875:Middle Aged; D027383:Papillomaviridae / Q000302:isolation & purification; D027382:Polyomaviridae