Question
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 |
Show Answer
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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.