Ovarian fibroma is a solid tumor that belongs to sex-cord stromal cell tumors of the ovary and comprises spindle shape fibroblastic cells and abundant collagen (1, 2). Furthermore they are the most common benign solid tumors of the ovary, which account for 1 − 4% of benign ovarian tumors (1, 3, 4). Ovarian fibroma is often difficult to diagnose preoperatively and usually misdiagnosed as uterine myoma, because of the solid nature of the mass on examination, and the ultrasonic similarities between the two anomalies. Ascites is occasionally present and is sometimes complicated by plural effusion, which is called Meig's syndrome. Occasionally the serum level of CA125 increases, which may lead to misdiagnosis of endometriosis or malignant tumors of the ovary (5, 6). This tumor occurs generally in elderly patients. In one study, 80.9% of the women were over 40 years old, and 49.0% of the patients were postmenopausal (7). Although rare, ovarian fibroma has been reported in young people too, in which the possibility of Gorlin syndrome, also known as nevoid basal cell carcinoma syndrome, must be considered (8–10).

The choice treatment for ovarian fibroma is surgical removal, but the operative approach, whether laparoscopic or open has not been discussed sufficiently. Surgeons are reluctant to use laparoscopic surgical management, as the benign nature of the tumor cannot be definitely diagnosed preoperatively and it might be difficult to laparosco-pically resect the tumor safely with preservation of ovarian function, especially in young patients.

In this case report, we presented a 24 year old patient with this tumor.

A 24 year old Gravida 1 Para1 (G₁P₁) lady presented to the gynecology clinic of Rasoul-e-Akram hospital with pelvic discomfort for one year, which was recently exacerbated and dominantly located on right lower quadrant of the abdomen. The patient had no medical or surgical history, except for one Pfannenstiel-kerr cesarean section about 3 years ago. Primary physical examinations revealed a mobile solid mass of nearly 12 − 14 cm in diameter, which couldn't be differentiated from a uterine myoma. Pelvic ultrasonography showed a mixed echo mass of 117×83 mm in right adenexa, with vascular flow and pressure on posterior wall of the uterus. There was no sign of ascites or plural effusion. Preoperatively, tumor markers were assessed, which were within normal range and patient was scheduled for laparoscopic resection of the lesion on December 2012 in Rasoul-e-Akram hospital.

As occurred in our case, ovarian fibroma is often difficult to diagnose and the tumor is not often diagnosed accurately until the time of surgery. There are no characteristic symptoms and the ultrasonographic findings cannot easily distinguish ovarian fibroma from uterine myoma or even other types of ovarian mass. It has been reported that 34% of ovarian fibromas were misdiagnosed preoperatively as uterine myoma (11). On the other hand, up to 67% of these patients suffered from ascites, even in a very small-sized tumor. Also, high levels of serum CA125 in many of these cases may frequently cause misdiagnosis of malignant ovarian neoplasia (12, 13).

Surgery is the unique treatment for ovarian fibroma. Salpingo-oophorectomy can be considered in perimenopausal or postmenopausal women, and cystectomy should be performed in youths.

Previous reports showed the tendency to non-conservative approach in older ages, especially in laparoscopic surgery (7, 14). Eop Son et al. reported only 5 cases of ovarian cystetctomy with laparoscopic approach in a retrospective review on 47 women with confirmed ovarian fibromas. Others underwent more invasive approaches, in which the ovary was sacrificed. The median tumor diameter in laparoscopic group was 7 cm in one study (7). In other reported series of ovarian fibromas with mean diameter of 12.82 cm, no ovarian preservation was reported (14). Son recently reported a case of bilateral salpingo oophorectomy, or a large 10 cm ovarian fibroma, using a single port laparoscopic approach in a 64 year old woman (7).

Ovarian preservation was mostly reported in younger patients and accompanied with Gorlin syndrome, which is present mostly with multiple and recurrent fibromas (8–10). For example, Ball et al. have reported 10 laparoscopic removals of ovarian fibromas, ranging from 3 mm to 7 cm in size (8). Seracchioli et al. reported laparoscopic removal of nine stony ovarian fibromas with ovarian tissue preservation, in a 22 year old girl (10). Although it was accepted to perform the surgery, either by laparotomy or laparoscopy, we recommend laparoscopy as the method of choice, especially in young patients, even in cases of very large ovarian fibromas.

Comparative analysis of the outcomes between the laparoscopy and laparotomy group showed that laparoscopic surgery has several advantages including careful preservation of ovarian tissue, lower rate of adhesion-that is very important in young nulliparous patients (for preventing infertility due to tubal factor), shorter hospital stay, faster normalization of bowel activities, faster return to social life, less morbidity and better cosmetic results (7).

Although there is a steady evolution towards less invasive techniques, laparoscopic approach to ovarian fibroma, especially in large tumors, may be challenging. However, we preserved nearly all normal ovarian tissue and safely removed the tumor by morcellator through a 10 mm trocar.

In conclusion, we should not forget the role of laparoscopy as a diagnostic procedure even in suspicious cases of ovarian fibroma with solid tumor, ascites, and plural effusion.

In these cases, the benefits of using laparoscopy should not be neglected since we are able to change the laparoscopy to laparotomy in large malignant stage1 tumors.