title: Richter's syndrome.
abstract: A 56-year-old man with chronic lymphocytic leukemia who developed Richter's syndrome is described. The criteria for diagnosis are given and the histology is discussed. We agree that Richter's syndrome represents a peculiar complication of chronic lymphocytic leukemia and not a separate disease entity. As such, Richter's syndrome must be known and recognized by those evaluating patients with lymphadenopathy whose basic diagnosis may be confused with Hodgkin's disease or "histiocytic" lymphoma.
mesh_terms: D006801:Humans; D007945:Leukemia, Lymphoid / Q000150:complications*; D008198:Lymph Nodes / Q000473:pathology*; D008214:Lymphocytes / Q000648:ultrastructure; D016403:Lymphoma, Large B-Cell, Diffuse / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D013577:Syndrome