The reported incidence of abdominal cysts in the pediatric population ranges from 0.1 to 0.2%, and many of these are ovarian in origin 1. Pediatric ovarian lesions are estimated to occur at a rate of approximately two to five cases per 100 000 girls every year 2,3. In the newborn population, cysts are the most common type of ovarian masses 4. Most of the ovarian cysts are benign and functional, arising as a part of normal ovulation 5.
Ovarian cysts in children are usually asymptomatic. However, variable symptoms such as acute or chronic lower abdominal pain, increased abdominal girth resulting either from complications such as torsion or hemorrhage inside the cysts or because of pressure on adjacent anatomic structures may occur 6.
Cysts larger than 4 cm are generally removed surgically to prevent complications, which could occur in approximately 36–71% of cases 7–10. Laparoscopic management of ovarian cysts is considered the surgical approach of choice by many pediatric surgeons 11,12 because of the potential development of less postoperative adhesions compared with conventional open surgery. However, many pediatric surgeons continue to choose laparotomy for large cysts because of technical difficulties and the possibility of malignancy 13–15.
In 1986, Tan and Bianchi 16 reported the use of a circumumbilical incision for pyloromyotomy. This technique was adopted by many pediatric surgeons for a number of other procedures, including management of ovarian cysts 17,18.
This study was conducted to compare the safety, feasibility, and postoperative cosmetic results of a minimally invasive transumbilical approach with those of a laparoscopic approach for treatment of ovarian cysts in neonates and children.
Patients and methods
This prospective study was conducted at the Tanta University Hospital and at affiliated hospitals from April 2005 to May 2011. All patients were diagnosed by ultrasonography. An additional abdominal computed tomography scan was performed in patients with a complex solid and cystic lesion.
Patients were randomly divided into two groups: group 1 (n=11) underwent surgical management through a transumbilical approach, whereas patients in group 2 (n=10) were treated by laparoscopic surgery.
An informed consent was obtained from parents, and the research protocol was approved by the Research Ethics Committee of the Faculty of Medicine, Tanta University (Egypt).
1. The transumbilical approach
Through a semicircular infraumbilical incision, the peritoneal cavity was entered into through a midline vertical fascial incision (Figs 1 and 2). The cyst was pushed to the site of the incision by external manipulation that allows its exposure. Aspiration of a part of the fluid contents of large cysts allowed external exteriorization of the partially collapsed cyst. Caudal extension of the fascial incision was needed for the extraction of cysts with solid parts (Fig. 3). The cysts were managed by cystectomy, partial deroofing, or adnexectomy outside the abdominal cavity. The fascia was closed by an interrupted 3/0 Vicryl suture (Ethicon, Johnson and Johnson, Somerville, New Jersey, USA), and the skin incisions were closed by a subcuticular 4/0 Vicryl suture.
2. The laparoscopic approach
This was carried out through three trocars. A 5 mm camera port was placed through the umbilicus using the open method. Another two 3 mm trocars were inserted at both right and left iliac fossae. Pneumoperitoneum was established with a pressure of 6–8 mmHg and a CO2 flow of 3 l/min. A 5 mm 0 lens was placed through the camera port to observe the ovarian cyst. A grasper was used to gently hold the gonad and dissecting scissors were used to enter the peritoneum overlying the cyst, which was carefully dissected down toward the ovary.
In case of a simple cyst, the cyst was carefully dissected down toward the ovary. The content of the cyst was then aspirated after a small puncture incision had been made. The cyst was unroofed and marsupialized close to the ovary. The surface of the cyst that remained on the ovarian tissue was cauterized, and the specimen was removed through the lateral port. In cases of torsion, salpingooophorectomy was performed. The umbilical port site was enlarged in two patients in this group to facilitate the extraction of mixed cystic and solid lesions. Vicryl 4/0 sutures were used to close the umbilical and trocar site incisions. The excised cysts and its fluid were sent for histopathologic examination.
Patients were evaluated as regards operative time, need to convert to open surgery or to increase umbilical incision, any intraoperative and/or postoperative complication, total hospital stay, and final cosmetic outcome.
Results were tabulated, studied, and statistically analyzed using Statistical Package for the Social Sciences version 16.0.2 (Chicago, Illinois, USA). The mean difference in continuous data was analyzed using the Student's t-test, whereas categorical data were analyzed using the Fisher's exact test.
A total of 21 patients with ovarian cysts were included in the study. The right side was affected in 11 cases. The left was involved in six cases. There were four cases with bilateral pathology. The size of the cysts was larger than 4 cm in all patients as measured by preoperative ultrasonography.
The ages of patients at the time of surgery ranged from 2 days to 8 years. Ten patients were younger than 1 month; the ages of six patients ranged from 1 to 12 months, and five children were older than 1 year. The ages were comparable in both the groups (Table 1).
Pattern of presentation
The various patterns of presentation were similar in both groups (Table 2). Nine cases were detected by prenatal ultrasound scan and referred for consultation either prenatally (n=5) or after birth (n=4). Only in three cases was the prenatal diagnosis precisely defined as ovarian cysts, whereas six cases were prenatally diagnosed as pelvic or abdominal cyst for differential diagnosis. The definitive diagnosis was confirmed after birth in all cases discovered prenatally.
Ten patients were asymptomatic at the time of diagnosis. These patients were identified by ultrasound examination either prenatally during routine antenatal examination (n=5) or incidentally after birth for nonspecific symptoms (n=5).
Acute abdominal pain presented by crying, restlessness, or refusal of feeding with or without associated vomiting were the salient symptoms in six patients with complicated ovarian cysts either by torsion(n=4) or by intracystic hemorrhage (n=2).
Five patients presented with nonspecific symptoms such as persistent lower abdominal pain or fullness resulting from the pressure on adjacent anatomic structures. A palpable pelviabdominal mass was observed in four of them.
The size of the cysts as measured by ultrasonography and confirmed during surgery ranged from 4.5 to 12.5 cm. The mean size of the ovarian cysts was not statistically significant in either group (8.2 vs. 7.8 cm). The operative time was shorter in group 1 compared with group 2 (45±12 vs. 55 ±10 min), almost reaching statistical significance (P=0.053).
It was possible to preserve a part of the ovarian tissue in 12 patients [eight (72%) in group 1 and four (40%) in group 2]. This difference was not statistically significant (P=0.198). Those patients had either cystectomy or partial deroofing. (Fig. 4). Complete excision of the cyst and ovary was mandated in six patients(two in group 1 and four in group 2) with complicated cysts by torsion or intracystic hemorrhage (Fig. 5). Excision of the cyst and ovary was carried out in another three patients with solid parts in the cyst because of the uncertain nature of the solid parts (one in group 1 and two in group 2). All specimens were benign and contained benign serous cystadenoma.
There were no intraoperative complications. Postoperative superficial wound infection occurred in one patient in group 1. The cosmetic appearance was excellent in all cases. Hospital stay ranged from 1 to 2 days in both groups.
There is no clear guideline with regard to the optimal management of ovarian cysts in infants and children. Many small ovarian cysts can be managed conservatively. Spontaneous regression of smaller cysts could occur in 25–50% of cases 19.
The appearance of a complex cyst with debris on ultrasonography, presence of large simple cysts (>4 cm), multiloculations, and persistent symptoms indicate surgical intervention because of the presumed risk of complications 7,20,21, such as torsion of the cyst on its own pedicle 7,22,23. These complications usually occur in cysts with a diameter of more than 5 cm 4,24.
Many cases of ovarian cysts were traditionally treated through an open approach. The conventional surgical approach through a lower transverse abdominal approach offers considerable exposure for the pelvis and the rest of the abdomen in neonates and young children. However, this approach has been replaced by minimally invasive surgery in many centers in the past three decades.
The recent advances in laparoscopic techniques markedly improve the cosmetic results 25. The laparoscopic approach allows visualization of the other ovary and the whole abdominal cavity and pelvic area for coexistence of associated pathologies. In addition, laparoscopy allows the surgeon to perform a therapeutic maneuver, to untwist a gonad in case of torsion, to resect the cyst wall in cases of well-preserved ovarian parenchyma, or to perform an ovariectomy or an adnexectomy if the parenchyma is damaged 4,21,26. The laparoscopic approach for ovarian cysts in newborns was reported to be easy to learn and is a safe and reliable method 27,28. Eltabbakh et al.11 reported a 94% success rate with laparoscopic management of benign ovarian cysts. These results are consistent with our results and with other published series 12. Exploration of the entire abdominal cavity is an advantage of the laparoscpic approach, especially if the preoperative diagnosis is not definite. Likewise, the excellent visualization of the surgical anatomy allows better preservation of important anatomic structures especially when operating on a smaller-sized child.
Despite several potential advantages of the laparoscopic approach, certain limitations of this approach include the need for specialized equipment 29, associated higher cost, and longer operating time 30. Furthermore, large cysts may limit the working space and hinder the insertion of the trocar. Poor tolerance to pneumoperitoneum in some newborns is another concern. A longer operative time was needed in patients treated by the laparoscopic approach compared with the transumbilical approach in the current series.
Circumumbilical incision was adopted by many pediatric surgeons for a number of other procedures including management of ovarian cysts 17,18. Ovarian cysts in neonates and young children can be easily accessible through the transumbilical approach because they are freely mobile as a result of a long pedicle and they are frequently located intra-abdominally because of a shallow pelvis. In the current series, no difficulties were noted during the extraction of large ovarian simple cysts by means of the transumbilical approach after decompression.
The dissection of mixed cystic and solid ovarian masses can be carried out through the transumbilical approach after extension of the skin incision and generous caudal extension of the underlying midline fascial incision. This was needed in one patient. On the basis of the difficulties in extraction of such mixed solid and cystic lesions, it might be more appropriate to choose conventional open surgery through lower transverse abdominal incision in nonovarian masses with considerable solid components.
Ovarian tissue preservation is recommended whenever feasible. This can be achieved by the enucleation of the cyst with ovarian reconstruction so as to preserve the reproductive function of the ovary. A part of the ovarian tissue was preserved in 12 cases (57%) in this series. Successful salvage of the ovary was noted in a larger percentage of patients treated by the transumbilical approach compared with laparoscopic surgery (72 vs. 40%). However, this difference can be explained by the larger percentage of complicated cysts in the laparoscopic group rather being attributed to the approach itself. In case of large or complicated lesions it may be impossible to preserve ovarian tissue, and oophorectomy then becomes necessary. Oophorectomy is considered the procedure of choice in cases of ovarian torsions or in cases of uncertain pathology 31,32.
When indicated, ovarian cysts in children can be managed effectively by either the transumbilical or the laparoscopic approach. Both approaches proved to be effective and safe with comparable results. The laparoscopic approach is advised when preoperative diagnosis is not defined. The transumbilical approach proved to be versatile and offers adequate surgical exposure. It can be a good alternative to laparoscopy for management of ovarian cysts in children when proper laparoscopic setup is absent.
Conflicts of interest
There are no conflicts of interest.
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