Immature Ovarian Teratoma

We present our experience of diagnosing immature ovarian teratoma with 2D and 3D vaginal ultrasound. A 29-year-old female patient with no symptoms was examined for routine gynecology examination before the start of an in vitro fertilization program. The patient had two previous surgeries both for ovarian cystectomy and histopathology finding of mature cystic ovarian teratoma. Left oophorectomy was performed for complex ovarian mass that demonstrated immature ovarian teratoma on final pathology. The neoplasm was well-differentiating (low-grade), according to two-tiered (low- and high-grade) system, and in IA stage, according to the Union for International Cancer Control (UICC) and American Joint Committee on Cancer (AJCC). The oncologist's council proposed that no treatment is needed. Keywords: 2D/3D ultrasonography, Immature teratoma, Ovarian teratoma. Donald School Journal of Ultrasound in Obstetrics and Gynecology (2020): 10.5005/jp-journals-10009-167