In people without symptoms, especially younger people, the likelihood of
coronary artery disease is low, despite an abnormal
test result. In such cases, a positive result is usually more likely to be false than true.
The gold standard is coronary angiography. I think you should undergo coronary angiography after the excision biopsy as you’ll also be assured if the coronary angiography comes out to be normal.
I hope that helps. Please do keep me posted. Kind Regards.