CTICasesAortic Coarctation with Unilateral Collateral Arteries
Imaging findings
CT angiography shows a severe aortic coarctation located immediately distal to the origin of the left subclavian artery. Extensive, dilated intercostal collateral arteries are present unilaterally on the right side, with relative sparing of the left side.
Key takeaways
The distribution of collateral vessels in aortic coarctation depends on the site of narrowing relative to the subclavian arteries. If the coarctation is distal to the right brachiocephalic but proximal to or involving the left subclavian, the left subclavian pressure is low, resulting in unilateral collateral development on the right side.
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