CT also shows no fractures and no lung contusions. However, there is a distinct fracture of the costosternal cartilage at the level of the 4th through 7th rib on the right with herniation of lung tissue through the defect. Interestingly, no pneumothorax is demonstrated, suggesting the pleura is still intact and herniates together with the lung.
The cartilage fracture can be easily overlooked when focusing only on bony fractures or lung tissue and doesn't show up in the commonly used bone window 3D volume rendering.
No other injuries were noted.