Young adult status post radiation therapy for sarcoma with an incidental finding on CXR

CXR and CT of osteochondroma of the rib
CXR PA shows a calcific density in the head of the left third rib. Contiguous images from an axial CT without contrast of the chest shows a bony outgrowth at the proximal aspect of the left third rib posteriorly.

The diagnosis was osteochondroma of the left third rib.