MCQ – 84648

Double aortic arch occurs due to –

A.	Non-development of right 4th aortic arch
B.	Non-development of left aortic arch
C.	Non-division of truncus arteries
D.	Persistent distal portion of right dorsal aorta

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Correct Answer � D Explanation

Answer is D. Persistent distal portion of right dorsal aorta

Double aortic arch occurs when an abnormal right aortic arch develops in addition to a left aortic arch due to persistence of the distal portion of the right dorsal aorta.

This forms a vascular ring around the trachea and esophagus, which may cause difficulties in breathing and swallowing.