Teenager with a sunken chest Pediatric Imaging Chest February 2, 2021January 15, 2021 3D reconstruction from a CT without contrast of the chest (above) and an axial CT from the same exam (below) shows posterior indentation of the sternum towards the spine. The Haller index was calculated to be 5.3. The diagnosis was pectus excavatum. Related Published February 2, 2021January 15, 2021