ABSTRACT
Entometrioid stromal sarcomas are seen in extra-uterine as well as extra-gonadal sites and have a strong association with endometriosis. Although having better prognosis than other sarcomas, yet these tumors may relapse (whether local or distant) in up to 56% of cases, even as late as 20 years after surgery. We report a case of a 30-year-old female patient with a mass in the inferior vena cava and right atrium which was surgically removed using cardiopulmonary bypass and deep hypothermic circulatory arrest and turned to be an entometrioid stromal sarcoma. The patient gave a history of endometriosis followed by the appearance of a low-grade ovarian endometrioid stromal sarcoma 4 years before the development of the mass in the IVC and right atrium.
