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What is the characteristic finding of sequestration?
The mass's arterial supply arises directly from the descending aorta.
How does the venous drainage differ between intralobar sequestration (ILS) and extralobar sequestration (ELS)?
ILS has common venous drainage via the pulmonary vein. ELS has common venous drainage via the systemic vein into the right atrium.
Mass in the left lower lobe with soft tissue density (26 HU) , with defined border and peripheral calcification. No visceral pleura around the mass.
The mass does not enhance in the arterial phase. Two feeding branches from descending aorta supply the mass, and the venous drainage is via the left pulmonary veins.