Dermoid Cyst of the Retrouterine Pouch of Douglas

Abstract

Summary Objective Benign cystic teratomas are one of the most common ovarian tumors. Teratomas of the retrouterine pouch of Douglas are extremely rare. We report a case of benign cystic teratoma of the Douglas pouch in a woman who underwent laparoscopic surgery. Case Report A 61-year-old woman presented with lower abdominal pain. On pelvic examination, a pelvic mass was palpated in the right adnexa. Transvaginal ultrasound demonstrated two cyst-like masses in the right adnexa. One was homogeneous and measured 4.0 × 3.5 cm, while the other was heterogeneous and measured 3.5 × 3.0 cm. The concentration of the CA125 tumor marker was 8.88 U/mL. On laparoscopy, a cyst 5 × 4 cm in diameter located in the right adnexa, and a 4 × 3 cm well-circumscribed tumor in the cul-de-sac were found. Pathology revealed a right ovarian simple cyst and a benign cystic teratoma in the pouch of Douglas. Conclusion The etiology of benign cystic teratomas of the Douglas pouch is poorly understood. We report a rare site of a benign cystic teratoma that may provide insights into the differential diagnosis of a pelvic mass in the retrouterine pouch of Douglas.