Symptomatic atraumatic dissection of a left internal mammary artery graft five years after coronary artery bypass graft surgery.

The case of a spontaneous dissection of a left internal mammary artery grafted on to the diagonal branch and the left anterior descending artery is reported. The clinical and diagnostic features of this condition are discussed. Despite an extensive literature search, no such case was found. The present case is the first to be reported. It was speculated that extensive kinking of the left internal mammary artery contributed to the pathogenesis of this syndrome.