From the Research
The correct answer is (c) extralobar sequestration is supplied by the aorta. Pulmonary sequestration is a congenital malformation where a segment of lung tissue develops without normal connection to the tracheobronchial tree. There are two types: intralobar and extralobar.
- Extralobar sequestration receives its blood supply from the systemic circulation, specifically the aorta or its branches, which is the correct statement 1.
- In contrast to option (a), pulmonary sequestration more commonly occurs on the left side, particularly in the lower lobes.
- Regarding option (b), intralobar sequestration is not supplied by the pulmonary artery but rather by systemic arteries, typically branches from the thoracic or abdominal aorta.
- For option (d), intralobar sequestration typically drains into pulmonary veins, not systemic veins.
- Finally, for option (e), extralobar sequestration usually drains into systemic veins, not pulmonary veins. This distinction in blood supply and venous drainage is important for diagnosis and surgical planning when treating pulmonary sequestration 2, 3, 4, 1. The most recent and highest quality study, which is from 2021, also supports the fact that extralobar sequestration is supplied by the aorta 4. Therefore, option (c) is the correct answer, as it accurately describes the blood supply of extralobar sequestration.