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| Double Aortic Arch |
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| General |
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| • | Most
common vascular ring |
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| • | Rarely
associated with congenital heart |
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| disease |
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| • | But
vascular ring tracheal and/or |
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| esophageal
compression |
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| • | Caused by
persistence of R and L IV |
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| branchial arches |
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