Collateral: Blood flow though vessels of your chest. See google images.
Answered 7/4/2012
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Bypass channels: The fetus/baby developed & is more or less normal in appearance at birth.That would only occur with the bodies ability to bypass the narrowing of a coarctation by channeling needed blood flow though other blood vessels(collaterals). A kid may go for a few years before the coarctation is discovered.
Answered 8/17/2017
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