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| Pulmonary Sling |
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| Embryogenesis |
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| • | Failure of
formation of left 6th aortic arch |
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| absence of
left pulmonary artery |
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| Proximal L VI arch |
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| normally becomes |
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| proximal
segment of L |
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| PA; distal VI
persists |
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| as ductus
until birth |
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