Infant who had undergone emergency thoracotomy for cardiac massage during a cardiac arrest 6 months before and now has a lump under the left arm

CXR of pulmonary herniation
CXR AP in inspiration (above) shows the left 5th intercostal space at the side of the previous thoracotomy to be deformed. CXR AP in expiration (below) shows interval development of a cystic structure in the soft tissues of the left chest wall.

The diagnosis was pulmonary herniation through the left 5th intercostal space secondary to incorrectly repaired thoracotomy incision.