Smooth muscle tumors of uncertain malignant potential (STUMP) are rare tumors that cannot be definitively classified as benign or malignant. In this clinical case, we present the case of a 50-year-old woman who consulted for hypogastric pain, urinary urgency, and abdominal distension. Transvaginal ultrasonography revealed an enlarged and irregularly shaped uterus with an intramural fibroid measuring 8.6 cm in diameter. The patient underwent a total abdominal hysterectomy, and pathologic examination revealed a uterine smooth muscle tumor of uncertain malignant potential with hypercellular spindle-shaped excess, cytologic atypia, and four mitoses in 10 high-power fields without cell necrosis. The immunohistochemical study ruled out malignancy of the smooth muscle tumor of uncertain potential. The patient is currently asymptomatic and undergoes check-ups every six months.