Deviggiano A, et al. - The relationship between the site of right cardiac compression, chest wall indexes (CT-CWI) and the sternal torsion angle (STA) was explored on the basis of cardiac magnetic resonance (CMR) and computed tomography (CT) among pectus excavatum (PE) patients. Researchers included 60 PE patients who underwent CMR and chest CT as presurgical evaluations. In this work, they established a CMR compression classification (CMR-CC) based on the analysis (in the horizontal long axis plane at end of diastole) of the right cardiac compression site, caused by the thoracic cage (sternum/ribs): Type 0 (T0): absence of cardiac compression; Type 1 (T1): compression of the lateral wall of the right ventricle (RV) without involvement of the atrioventricular (AV) groove; Type 2 (T2): compression of the RV involving the AV groove. The types demonstrated significant differences regarding CT-CWI (the Haller Index and the correction index) and STA.