Unstable angina due to spontaneous dissection of a LIMA graft.

We report a case of a spontaneous dissection of a left internal mammary artery grafted on the diagonal branch and the left anterior descendens. The clinical and diagnostic features of this condition are discussed. Despite an extensive literature search, no such case could be found. This case report must be regarded as the first. We speculate that extensive kinking of the left internal mammary artery contributed in the pathogenesis of this syndrome.