Chest radiographs of an asymptomatic 36-year-old man with normal physical findings.
The radiographs show that the large right paracardiac mass represents bowel that has herniated anteriorly into the chest, presumably through a congenital diaphragmatic defect involving the Foramen of Morgagni. A computed tomographic scan (image below) confirmed the diagnosis.
Such herniation typically occurs on the right but can be left-sided or bilateral. Surgical repair is recommended in most cases to prevent obstruction or strangulation of the bowel.