Bronchopulmonary sequestration commonly obtains arterial blood supply from which circulatory source?

• A. Pulmonary artery
• B. Cardiac ventricle
• C. Systemic circulation
• D. Pulmonary veins

Answer: (C)

Bronchopulmonary sequestration is defined by receiving arterial blood from the systemic circulation, most often a branch of the thoracic aorta, rather than from the pulmonary arteries. This reflects that the sequestered tissue is abnormal lung tissue that does not connect to the airway and is fed by high-pressure systemic arteries. Therefore, the arterial supply comes from the systemic circulation. The pulmonary artery would supply normal lung tissue, and the pulmonary veins are venous drainage, not arterial input; the cardiac ventricle is not a direct source of arterial supply to a sequestration.