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- Apr 11, 2009
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I'm having trouble understanding why there's Rib Notching with Postductal Coarctation if 9 of the 11-12 pairs of intercostal arteries originate on the posterior side of the Aorta AFTER the Coarctation (The Pressure in those arteries will be lower). Where do the collaterals come from, and why would they cause Notching? I can see how the first and second ribs would have notching, due to the increased pressure in the Subclavian arteries, Costocervical trunk and ultimately the first and second posterior intercostal arteries (They'd be engorged and would cause erosion of the inferior ribs). Please Explain!?!?