Suspicious myometrial mass on ultrasonography and MRI does not necessarily mean a sarcoma on histology

We report an unusual ultrasonographic and magnetic resonance imaging (MRI) presentation of a myometrial mass in a 38-year-old woman hoping to conceive. Hysterectomy had been proposed elsewhere because of the suspicious nature of the mass, but the patient was seeking a second opinion. This atypical formation looked consistent with either hydropic degeneration of a uterine myoma or leiomyosarcoma, but preoperative differential diagnosis was impossible. Laparoscopic tumorectomy was performed and histology confirmed a degenerating uterine myoma. We, therefore, show that unusual ultrasonographic and MRI findings do not necessarily require radical surgery, even if sarcoma cannot be excluded preoperatively, especially in patients who wish to conceive.