Most commonly, ductus aeriosus is: (A) Just proximal to the left common carotid, (B) Just distal to the left subclan, (C) Just distal to the left common carotid, (D) Just proximal to the left subclan
Answer is B. Most commonly, the ductus aeriosus is just distal to the subclan, and the ductus enters the pulmonary aery at its bifurcation. Ref: Nelson textbook of pediatrics 21st edition Pgno: 2344