en Gynecology & Obstetrics Gynecology & Obstetrics case report case report <p> <strong>Absract</strong></p><p> A case of 69- year-old woman with large pelvic mass and ascites is reported in</p><p> this paper. With the exception of mild pelvic pain and a Pelvic mass in pelvic , she</p><p> had no symptom or sign . All routine and hormonal Lab tests and tumor marker's were</p><p> normal. The MRI revealed a large mass in anterosuperior of uterus, and left ovary</p><p> was situated in neighborhood of pelvic mass.Her Uterus normal, with a small cyst in</p><p> the right ovary. The total abdominal hysterectomy and bilateral salpingo- oophorectomy</p><p> revealed a large cream solid mass (16×8× 8 Cm, 1260 gr) in the left ovary</p><p> .Nonetheless the right ovary had normal appearance with a cyst (3×2.5Cm). There</p><p> was some free fluid in the pelvic cavity. The ovarian mass was identified as fibrothecoma,</p><p> the right ovarian cyst as serous cystadenoma, but no malignant cells found in</p><p> free fluid. This case had interesting features, because first clinical features suggested</p><p> a bilateral malignancy in pelvic, but she had two different tumors which were benign.</p><p> Also, the occurrence of bilateral fibrothecoma and serous cystadenoma were</p><p> rare . Furthermore, we did find no similar case in the literature.</p> Serous tumors, fibrothecoma, bilateral ovarian tumors, pelvic mass 246 249 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-124&slc_lang=en&sid=1 Mohammad Hosain Badakhsh h.badakhsh@yahoo.com 20031947532846001278 20031947532846001278 Yes Department of Tehran University of Medical Sciences, Tehran,Iran Farrokh Taftachi taftachi@iums.ac.ir 20031947532846001279 20031947532846001279 No Department of Tehran University of Medical Sciences,Tehran, Iran Fateme Kheshti fatemekheshti@yahoo.com. 20031947532846001280 20031947532846001280 No Department of Iran University of Medical Sciences, Tehran, Iran Faride Dadkhah far_dadkhah@yahoo.com. 20031947532846001281 20031947532846001281 No Department of Iran University of Medical Sciences, Tehran, Iran.