Congenital Uterine Cyst, Histology, and Differential Diagnosis of a Pelvic Mass

Background: A uterine cyst is a controversial and rare pathologic entity, characterized by being a benign lesion located in the thickness of the uterine myometrium. There are few reports in the literature, and those that are accompanied by histologic descriptions are even less frequent. Case: A 57-year-old woman presented with a simple cystic formation of 4.2×3.7 cm, located in the midline of the dome of the uterus, suggesting a simple cyst. After complete excision, histologic examination revealed the presence of a cystic structure lined by tall ciliated columnar epithelium without atypia, showing a well-developed muscular underlying wall. These findings were consistent with a cystic uterus. Results: There were no other gross pathologic findings in any other abdominal organs. She was discharged without any incidents the fourth day after surgery. Conclusions: This report describes a case of a uterine cyst, reviews some recent literature, and provides a histopathologic and immunohistochemical descr...