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Unifocal pulmonary blood supply in a patient of group II (A). Balloon blockade angiography in the descending aorta shows filling of the central pulmonary arteries through a large major aortopulmonary collateral artery (arrow). Angiography at a lower level (B) reveals a second major aortopulmonary collateral connecting to the left pulmonary artery, with retrograde filling of the bifurcation (dual blood supply of the central pulmonary arteries).
