Angiographic findings in spontaneous coronary artery dissection. Angiographic findings in spontaneous coronary artery dissection. (A) Coronary angiography of the left anterior descending artery (LAD) demonstrates extensive dissection from proximal to distal involving the proximal and mid-part of a large diagonal branch. (B) Coronary angiography of the obtuse marginal branch of the circumflex artery demonstrates a mid-segment long tubular narrowing consistent with dissection. Lucy McGrath-Cadell et al. Open Heart 2016;3:e000491 ©2016 by British Cardiovascular Society