This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Lung), Subject name: Surgery
Intralobar sequestration of lung takes its blood supply from - 
Select and explain. 
A. Internal mammary artery', B. Descending abdominal aorta, C. Pulmonary artery, D. None of the above
B: Descending abdominal aorta
Answer: B: Descending abdominal aorta 
Explanation: Ans. is 'b' i.e., Descending abdominal aorta o A sequestration consists of normally developed bronchioles and alveoli supplied by systemic rather than pulmonary arteries.o This blood supply is from the Aorta either above or below the diaphragm.o Mostly fapprox 95%) this is from the descending thoracic aorta.o Other characteristic features of sequestration -They occur most commonly in the lower lobes, L > RLung sequestrations are of two typesIntralobar (~75%)Extralobar (~25%)o Draing through pulmonary veinso Are in communication with tracheobronchial tree o Prone to infection and lung abscess formationo Drain into the azygous venous systemo Do not communicate with lungo Commonly asymptomatico Associated with congenital diaphragmatic herniaTreatmentIntralobar sequestration - LobectomyExtralobar sequestration - Excision