Clear Cell Carcinoma of the Endometrium in a Patient Presenting with Postmenopausal Bleeding but Negative Endometrial Biopsy.

Endometrial carcinoma is the most common gynecological malignancy in the USA with approximately 66,570 cases and 12,940 deaths in 2020. Clear cell carcinoma (CCC) of the endometrium is an estrogen-independent type II endometrial cancer which accounts for <5% of endometrial cancer. When diagnosed roughly, 45% of patients have extrauterine metastases. Current American College of Obstetrics and Gynecology guidelines recommend transvaginal ultrasound for postmenopausal bleeding and a biopsy for those with endometrial thickness >5 mm. However, we present a case of a postmenopausal woman with a history of fibroid where endometrial biopsy has failed to make diagnosis twice. Hence, further testing should be performed in patients with unexplained postmenopausal bleeding including vaginal hysterectomy with lymph node dissection.