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My Cardiologist confirmed the comment from the doc responding to the Interventional Cardiology section of this forum that it was probably caused due to location between two earlier stents, it set up a spasm of some sort.
I certainly know nothing, I'm just a fellow heart patient, but I know that a spontaneous dissection is generally considered a serious condition. I'd consider another opinion if that is possible to you, especially if the two opinions you have are from doctors in the same hospital. Others on this site might be able to guide you how to have your records sent to a place like the Cleveland Clinic or other top-notch cardiac hospital/research center, I don't know how that is done.
Good luck, I hope you find a solution. I'm going to monitor your posting hoping to hear something postitive from you.