The authors report a case of a fifty-five-year-old woman with clinical and echocardiographic diagnosis of right atrial myxoma. At fluoroscopy and phlebography a mobile calcified peduncle was appreciable originating from the left ovarian vein. This passed through the inferior cava to the right atrium where it wound round itself and extended into the right ventricle during diastole. The authors suspected the presence of a vascular leiomyoma. The tumor and its peduncle were removed by pulling through the right atrium during extracorporeal circulation. The site of origin was confirmed at pelvic surgery.