title: Case records of the Massachusetts General Hospital. Weekly clinicopathological exercises. Case 31-1978.
mesh_terms: D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D008223:Lymphoma / Q000175:diagnosis / Q000473:pathology*; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis / Q000473:pathology*; D010996:Pleural Effusion / Q000209:etiology