Low-grade Endometrial Stromal Sarcoma Primarily Arising in the Vagina: A Case Report.

BACKGROUND: Endometrial stromal sarcoma (ESS) is a rareform of endometrial cancer, comprising < 0.2% of all uterine malignancies and 10% of all uterine sarcomas. To date, the English-language literature contains 6 reports of extrauterine ESS arising primarily in the vagina. We describe the seventh such case, and the first case in which the origin is at the introitus of the vagina. CASE: A 43-year-old, nulligravid, Caucasian woman presented for an annual gynecologic examination and was found to have an asymptomatic 5 x 5-mm, rubbery, soft tissue mass at the 5 o'clock position of the vaginal introitus. As has been reported in several cases of low-grade ESS, this case originated at a site of endometriosis. CONCLUSION: Based on our experience as well as a thorough review of the literature, it appears that early stage low-grade ESS arising in the vagina can be treated effectively with surgical resection followed by close observation for recurrence.