To find the human aorta arching over the right bronchus, as is normal in birds, has attracted the interest of anatomists for two centuries. Most of the cases on record have been discovered incidentally in the dissecting hall. Since roentgenologic studies in the past fifteen years have made the diagnosis of this condition possible in life, it has become of more than academic interest. It is one cardiovascular anomaly that can be recognized with certainty during life; yet, so far as we have been able to learn, no case so recognized has been reported in English up to the present.
It is well to begin with a brief review of the embryologic processes through which the definitive aorta is formed from the primordial vascular network of the branchial arches. The steps in this development have been beautifully illustrated by Congdon.1 In the 13 mm. stage (fig. 1, E
BLACKFORD LM, DAVENPORT TF, BAYLEY RH. RIGHT AORTIC ARCH: I. CLINICAL REPORT OF A CASE WITH ASSOCIATED ANOMALIES. Am J Dis Child. 1932;44(4):823–844. doi:10.1001/archpedi.1932.01950110125012
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