title: Undetected foreign object.
mesh_terms: D000368:Aged; D006348:Cardiac Surgical Procedures; D016724:Empyema, Pleural / Q000209:etiology*; D005547:Foreign Bodies / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology; D006801:Humans; D008297:Male; D012307:Risk Factors; D013525:Surgical Instruments; D015503:Surgical Sponges