"Tumor vascularity" in left atrial thrombus demonstrated by selective coronary arteriography.

Coronary arteriography was performed during preoperative investigation of mitral valve disease in a 62-year-old woman. "Vascular puddles" arising from the left coronary artery were seen within a large filling defect in the left atrium, raising the suspicion of myxoma. At surgery, the filling defect proved to be partially organized thrombus. "Tumor vascularity" can be a feature of left atrial thrombus as well as myxoma.