Pectus excavatum on chest radiograph and computed tomography scan

(A) A posteroanterior view of the chest shows horizontally oriented posterior ribs (arrow) and an ill-defined right heart border (arrowhead), which has been shifted to the left behind the sternum and in front of the vertebral column. The anterior ribs are oriented vertically (dashed arrow).
(B) A lateral view of the chest shows a posteriorly positioned sternum (arrow).
(C) An axial CT scan of the chest at the level of the heart shows a depressed sternum, a compressed right atrium (arrowhead), and leftward displacement of the heart.
(D) A sagittal reformat of the CT scan of the chest through the sternum shows posterior displacement of the sternum (arrowhead) and compression of the right atrium (arrow).