Background. Although many histopathological, clinical, and imaging findings of ESS have been described, intense calcifications have not been reported previously. Case. A 54- year- old female was admitted with vaginal bleeding and abdominal pain. Gynecologic examination revealed a huge, firm pelvic mass extending up to the epigastrium. Transabdominal ultrasonography and computed tomography demonstrated a well-demarcated uterine mass containing heterogeneous solid and cystic areas and a centric curvilinear calcification. Histopathological diagnosis was established as undifferentiated high-grade endometrial stromal sarcoma. Conclusion. Endometrial stromal sarcomas should be considered in the differential diagnosis of uterine masses containing curvilinear calcifications.
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