We report about a rare case of acute abdomen in a 43 years old female patient who noticed a sudden onset of severe lower abdominal pain, increasing in strength within a few hours. The transabdominal and transvaginal ultrasound showed an enlarged leiomyomatous uterus with a questionable torsion of a pedunculated subserous leiomyoma. The following magnetic resonance imaging confirms this diagnosis. During the laparoscopy a myomectomy has been performed.