Uterus-like mass in the right broad ligament: A case report.

Rationale: Uterus-like masses (ULMs) are rare benign lesions that resemble the uterus.

Patient Concerns: Here, we describe the case of a woman with a ULM in the right broad ligament. A 51-year-old woman with a 2-month history of irregular vaginal bleeding was found to have a mass in the right broad ligament. Imaging studies revealed a solid-cystic lesion, suggestive of an endometrial cyst with malignant transformation.

Interventions: She underwent prompt surgery for the removal of the mass. Intraoperatively, the uterus and ovaries appeared normal, and an 8-cm-long mass was observed in the right broad ligament without any connection to the uterus or ovaries. The mass was successfully excised.

Diagnoses: Postoperative histopathological examination showed that the cystic mass was filled with a blackish-brownish fluid and that it had thick walls resembling the uterine myometrium. The cyst center was lined by endometrial glands that were positive for cytokeratin as well as estrogen and progesterone receptors, and by stromal cells that were positive for CD10.

Outcomes: The patient recovered well and has had no further symptoms during 2 years of follow-up.

Lessons: We have reported a case of ULM in the right broad ligament in a Chinese woman. Although ULMs are rare, they should be considered in the differential diagnosis for pelvic masses.