Adenocarcinoma of the endometrium with intrauterine pregnancy is extremely rare. We report the case of a 35-year-old woman with endometrial cancer discovered in the 7th gestational week. A therapeutic abortion was performed and because of bleeding and spotting dilatation and curettage was done 10 days later. Histology revealed adenocarcinoma in addition to products of conception. Hysterectomy and bilateral salpingo-oophorectomy was performed 3 weeks after intracavitary radiotherapy. Because of superficial myometrial infiltration demonstrated microscopically, the patient received intravaginal and external radiation postoperatively. She remains well 1 year after diagnosis.