Double aoic arch occurs due to?: (A) Non development of right 4th aoic arch, (B) Non development of left 4th aoic arch, (C) Non divison of truncus aeriosus, (D) Persistent distal poion of right dorsal aoa
Answer is D. Double aoic arch occurs due to persistent distal poion of right dorsal aoa. This will lead to difficulty in breathing and swallowing due to compression of bronchi and esophagus by Right side aoic arch.