The pericardium.
D002305:Cardiac Tamponade / Q000503:physiopathology / Q000601:surgery; D002913:Chyle; D003560:Cysts / Q000503:physiopathology / Q000601:surgery; D006330:Heart Defects, Congenital / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D010490:Pericardial Effusion; D010494:Pericarditis, Constrictive / Q000503:physiopathology / Q000517:prevention & control* / Q000601:surgery; D010496:Pericardium / Q000502:physiology / Q000503:physiopathology / Q000601:surgery; D011026:Pneumopericardium / Q000601:surgery; D011185:Postpericardiotomy Syndrome / Q000503:physiopathology; D014381:Tuberculosis, Cardiovascular / Q000503:physiopathology / Q000601:surgery