Barrel chest is a relatively common chest wall deformity characterized by the following features:
- Overall outward convexity of the anterior chest wall with increased anteriorposterior diameter.
- The anteroposterior diameter is nearly equal to the transverse diameter, giving the chest a barrel-shaped appearance.
- Reduced rib inclination, with the angle between the ribs and the spine often exceeding 45 degrees.
Marked widening of the intercostal spaces and an increased infrasternal angle.