Figure 42: Discrete juxtaductal coarctation. The posterior shelf (Sh) is seen just distal to the left subclavian artery (LSCA). The ductus arteriosus (DA) is opposite the posterior shelf. Note the fleshy, corrugated appearance of the ductus tissue, completely different from either the main pulmonary artery (MPA) or the descending aorta (DAo). The distal arch (*) is mildly narrow. AAo - ascending aorta; LPA - left pulmonary artery.