Coarctation is the term applied to the congenital stricture of the arch of the aorta below the origin of the left subclavian artery. This condition exists in two distinct forms as differentiated by Bonnet:1 the "infantile" and "adult" types, according to the morphology and, possibly, the etiology of the lesion. In the first group he places cases presenting a diffuse narrowing of the fetal isthmus of the aorta, which may be regarded as the persistence of the normal relationship before closure of the ductus arteriosus. In the "adult" type there is found a relatively abrupt stricture, even complete obliteration, at or in the immediate vicinity of the ligamentum arteriosum. The constriction often resembles that produced by a ligature around a vessel and has been (probably erroneously) termed nondevelopmental and attributed to postpartum extension of the tissue of the ductus into the wall of the aorta. This explanation was first advanced
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