“…Cardiac complications associated with M. pneumoniae are relatively uncommon, but involvement has been reported at rates of from 1 to 8.5% in persons with serological evidence of infection, somewhat more commonly in adults than in children (287,330). Pericarditis, myocarditis, and pericardial effusion with and without cardiac tamponade have all been described, and the organism has been detected in pericardial fluid (24,122,128,171,218,248,287,364,384,400).…”