Case report of the male with an anterior STEMI to whom a primary PCI is performed. The angiogram shows a fluctuating close of the LAD and Cx than when an OCT is performed does not clearly see any pathological findings but when the IVUS is performed, it is clearly seen as a coronary haematoma at the LM, LAD and Cx. Stent at the LM-LAD and proximal Cx are implanted with final good result. After exchanging the guiding catheter for a diagnostic catheter to visualize the RCA, there is an aortic flap; the coronary haematoma was coming from an ascending aortic dissection. The CT confirms the type A aortic dissection and the patient is sent to urgent surgery where it seems that the point of intimal disruption is close to brachiocephalic trunk; a supracommissural ascending aortic replacement is performed. After several complications the patient did well and he is alive. Although the patient got the right approach, as we focused on the coronary arteries we did not realized there was an aortic dissection until the end of the procedure.
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