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©2013 UpToDate ® Print Email Benign ovarian teratoma Ultrasound image of a benign teratoma which has the appearance of a complex mass (arrow). Courtesy of Jorge Londono, MD. Transabdominal image of the left adnexa Benign cystic teratoma (dermoid tumor) of the left ovary is indicated by the arrow. The complex nature of this tumor is demonstrated with both hypoechoic and hyperechoic echogenic areas intermixed. The similarity to surrounding bowel and overlying abdominal wall can make this tumor difficult to visualize. The margins are measured with the electronic calipers. Courtesy of Thomas D Shipp, MD. Transvaginal image of the right adnexa Benign cystic teratoma (dermoid tumor) of the right ovary. The complex nature of this small tumor is demonstrated. The long arrow indicates the solid hyperechoic echogenic portion with shadowing of the ultrasound beam distal to the echogenic portion. The short arrow demonstrates the anechoic cystic portion with post cyst enhancement of the ultrasound beam. Courtesy of Thomas D Shipp, MD.