Infant with cough who had experienced a traumatic delivery 4 months ago Pediatric Imaging Musculoskeletal December 7, 2020November 23, 2020 CXR AP shows clear lungs and an area of callus surrounding the right 7th rib posteriorly. The diagnosis was chronic right 7th posterior rib fracture caused by a traumatic birth. Related Published December 7, 2020November 23, 2020