title: Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 13-1980.
mesh_terms: D001921:Brain / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007968:Leukoencephalopathy, Progressive Multifocal / Q000175:diagnosis / Q000473:pathology*; D008168:Lung / Q000473:pathology; D008175:Lung Neoplasms / Q000175:diagnosis / Q000473:pathology*; D008223:Lymphoma / Q000473:pathology*; D008875:Middle Aged; D011658:Pulmonary Fibrosis / Q000175:diagnosis / Q000473:pathology*