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Choice of collaterals for retrograde approach. (A) Good interventional septal collaterals from LAD to RCA. (B) No-interventional septal collaterals: there is no connection with the DP of RCA. (C) No-interventional epicardial collaterals: connection with PL ramus of RCA but small and tortuous at high risk of perforations. The arrows show the collateral vessels.
