Uterine Tumor Resembling Ovarian Sex Cord Tumor: A Case Report.

Uterine tumors resembling ovarian sex cord tumors (UTROSCTs) are extremely rare, occurring in less than 1% of uterine stromal tumors, and they are considered to have a low malignant potential. Due to the small number of cases, no standard treatment has been defined. A 77-year-old woman with postmenopausal bleeding was admitted to our department. Imaging studies revealed a substantial mass around 30 mm in size on the anterior uterine wall. A total hysterectomy and bilateral salpingo-oophorectomy were performed for further diagnosis and treatment. The tumor revealed histopathological findings of a sex cord-like growth pattern in the form of fascicles, cords, or small nests. Immunohistochemical findings revealed that the tumor cells were positively reactive to alpha-SMA, calretinin, CD99, estrogen receptor, and progesterone receptor, collectively diagnosed as UTROSCT. No recurrence was observed over 12 months after treatment. We experienced the treatment of UTROSCT, an extremely rare tumor that occurs in elderly women. Although most cases of UTROSCT have a benign clinical course, several cases of recurrence and metastasis have been reported. It should be followed up for a long term after treatment.