Figure 16b. Inflammatory constrictive pericarditis in an 8-year-old boy with progressive shortness of breath after undergoing surgical repair of an atrial septal defect. Axial ECG-gated T1-weighted SE image (a) and axial gadolinium-enhanced fat-saturated T1-weighted SE image (b) show an abnormally thickened pericardium (arrows in a) that enhances after gadolinium administration (arrows in b).