The authors present smooth muscle tumors of uncertain malignant potential (STUMP) diagnosis and surgical management of a spontaneously-ruptured degenerated uterine fibroids. A 48-year-old nulliparous presented with a two-day history of abdominal pain, bloating, constipation, and menorrhagia. Within eight hours, her distress level increased. Computed tomography (CT) scanning of the abdomen showed a large, 31 x 25 cm solid-cystic lesion. An emergency laparotomy was indicated. Surgery revealed approximately 2,000 cc of blood and a 30 cm degenerated uterine fibroid with a fundal rupture, cystic, and solid components extending to thelower pole of the liver. Pathology results noted mild nuclear atypia, six mitoses per ten high power fields (hpf) and necrosis spread that was not coagulative with a STUMP diagnosis. STUMP presents a problematic group of uterine smooth muscle tumors for any clinician. In addition, STUMP can rarely cause acute complications like a rupture. Therefore, prompt diagnosis and effective management are important.