It is speculated that MAPCAs are enlarged bronchila arteries in whom the broncho-pulmonary anastamosis has enlarged.
(First 2 images are from MA Norgaard et al. Eur J Cardio-thorac Surg 2006;29:653-8)
The following 2 images are from Ingram Schulze-Nick et al. Circulation 2000;102 (Suppl III):III-142-III-147.
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