title: Pleural effusion and abnormal protein electrophoresis.
mesh_terms: D003937:Diagnosis, Differential; D006689:Hodgkin Disease / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010996:Pleural Effusion / Q000175:diagnosis; D008258:Waldenstrom Macroglobulinemia / Q000175:diagnosis*