Pseudoxanthoma elasticum of the internal mammary artery.

A case of pseudoxanthoma elasticum of the left internal mammary artery from a 61-year-old male who underwent coronary artery bypass grafting is reported. Intraoperative evaluation of the left internal mammary artery revealed partial stenosis. Histologically, the stenotic portion showed pseudoxanthoma elasticum. This represents the first reported case of pseudoxanthoma elasticum in the internal mammary artery.