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)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitHtM6RCNKm6PMh7RuxIdm1qrIVU4MLNNlquDYgpOpSTx7NqjgKUC7jaJlAIihUQCONygZZ9l7bOJTPt2Tmi8kRKF2vlEs2jDXi5xFIwgAMytSkIs_cW_uu8Jcblxem8SofJ3rHg/s400/MAPCAs.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdh5SdfsY_cev5TVO7-V7XoHpbEmpK2xFrwA6f7MC5-1owEZpGIkTzlYeOp7Fjpz-LKtP-EFvn2Gs2tgd_kDZK0lHlOnd-RbT6TcAObczvj5S_gxTl1ARNF56DIJgEo9ywCAA-Dg/s400/MAPCAsClassification.jpg)
The following 2 images are from Ingram Schulze-Nick et al. Circulation 2000;102 (Suppl III):III-142-III-147.![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinzrGObDg7-bBO4icjdxDmTNQrfxu1z22PDOGXmeEG3sMVP5Dcj-_zJpX2qCljbBQfN1My4PgPmbcj6oE0kOIHny0Vg0rMuXbDWJnQNQWsFDTLWfaM4xBnlCvnMzYOnh8HBXKe2A/s400/MAPCAsUnifocalization.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinzrGObDg7-bBO4icjdxDmTNQrfxu1z22PDOGXmeEG3sMVP5Dcj-_zJpX2qCljbBQfN1My4PgPmbcj6oE0kOIHny0Vg0rMuXbDWJnQNQWsFDTLWfaM4xBnlCvnMzYOnh8HBXKe2A/s400/MAPCAsUnifocalization.jpg)
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