Background: Smooth muscle tumor of uncertain malignant potential (STUMP) of uterus indicates a group of uterine smooth muscle tumors that are not diagnosed unequivocally as either benign or malignant. It is a rare tumor in young women. It is considered as a "transition" tumor between leiomyoma and leiomyosarcoma or possibly undiagnosed leiomyosarcoma. Case description: We herein report a case of uterine STUMP in a 28-year young nulliparous woman who presented with a symptom of continuous dull aching lower abdomen pain. MRI pelvis shows large transmural vascular mass. Underwent radical hysterectomy, histopathology report, and immunohistochemistry showed STUMP with ki67 <10%. Conclusion: STUMP is a rare tumor with inconsistent diagnostic criteria and has no definitive treatment protocols especially in young women who desire for fertility.
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