A unique stenosis in saphenous vein graft visualized by optical coherence tomography.

We present a case of a unique stenosis in a 12-year-old saphenous vein graft (SVG), to the right coronary artery, which was visualized by optical coherence tomography (OCT), before percutaneous coronary intervention. The patient was an 80-year-old man in whom the stenosis was documented by area-detector coronary computed tomography. OCT imaging demonstrated that the culprit lesion was a venous valve containing a thrombus before preintervention imaging. Coronary stenting was performed with a distal protection device, and pathologic examination of the aspirate verified the OCT findings. Coronary angiography 12 years previously, just after coronary artery bypass surgery (CABG), had shown a completely normal SVG without any suspicion of a venous valve. These OCT images suggested the possibility that the culprit lesion was an "upside down" venous valve that was not visualized by angiography just after surgery, but could be a cause of late SVG stenosis following CABG. OCT imaging is very useful for clarifying the etiology of the stenosis in cases of ambiguous angiographic lesions.