A pseudoneoplastic finding of deep endometriosis: laparoscopic triple segmental bowel resection

Introduction



Deep infiltrating endometriosis is defined as endometriosis infiltrating the peritoneum by more than 5 mm; it is reported in approximately 20% of all women with endometriosis. Gastrointestinal involvement of endometriosis, the most common location for extra-genital endometriosis, has been reported in 3–37% of fertile women and the rectum and the recto-sigmoid junction together account for 70–93% of all intestinal lesions [1]. Small bowel involvement, usually confined to the distal ileum, is less frequent (1–7%), while cecal endometriosis is rare (0.03%) [1]. Only one-third of patients with colorectal endometriosis is symptomatic. A bowel obstruction complicates sigmoid endometriosis in 1–10% of cases [1].



Case report



A 36-year-old woman referred to our center for worsening dysmenorrhea, dyschezia and epigastric menstrual pain. A diagnostic laparoscopy was performed elsewhere, revealing deep pelvic endometriosis. No bowel surgery was performed and only medical therapy was recommended, without benefit. Furthermore, after 3 years of attempts of spontaneous conception, the patient underwent three unsuccessful cycles of in-vitro fertilization. Abdominal and pelvic ultrasound scan showed pelvic effusion. A tight stenosis of the recto-sigmoid junction did not allow the passage of contrast at the double-contrast barium enema (DCBE) and a computed tomography (CT) scan was performed to investigate the proximal colon. A modest increase of markers CA125 (184 UI/ml) and CA19-9 (85.20 UI/ml) was observed.

Subsequently, the patient underwent an operative laparoscopy in our center. Copious brownish fluid (4200 ml) filled the pelvis, reaching the upper abdomen. The intra-operative cytologic examination of the fluid excluded the presence of neoplastic cells. The Douglas pouch appeared completely obliterated due to the presence of adhesions between the uterus and the rectum-sigmoid junction, where there was an endometriotic implant of about 8 cm. The adnexa were completely surrounded by adhesions. The cecum and the last ileal loop were infiltrated by a nodular mass of about 4 cm of unknown origin. Similarly, another nodule of 5 cm was found on the transverse colon, infiltrating the gastrocolic ligament to the edge of the great gastric curvature. Glisson’s capsule showed multiple small white lesions. Similar spots were observed on the spleen (Photo 1). An extemporary histological evaluation was carried out on biopsies, showing a pattern suggestive for endometriosis. On intraoperative ultrasound scan, the liver appeared hyperechogenic without focal lesions. Multiple liver biopsies revealed at pathological intraoperative evaluation a framework compatible with reactive capsulitis.

Complete excision of pelvic endometriotic lesions was performed according to a radical, nerve, and fertility sparing surgical technique [2]. The intestinal surgery was performed by a colorectal surgeon after the placement of a fourth trocar on the upper right quadrant of the abdomen (Photo 2).

The left colon was mobilized using an Ultracision Harmonic scalpel (LCS 10; Ethicon Endosurgery, Cincinnati, OH, USA) for dissection. The gastrocolic ligament was opened and the ascending colon was mobilized. Afterwards, the inferior mesenteric vessels were transected and subsequently transection of the rectum was performed. Through a longitudinal supra-umbilical mini-laparotomy sized 4 cm, the transverse colon was exteriorized and the stenosing part of the bowel was resected; an end-to-end stapled colonic manual anastomosis was performed. Through the same laparotomic incision, the last ileal loop, the cecum and part of the ascending colon were exteriorized. A second bowel resection was performed at this level and an end-to-side stapled mechanical anastomosis (25 mm) was completed; the colonic stump was sutured with GIA 80 (Tyco US Surgical Healthcare Auto Suture). Afterwards, through the same incision, the descending colon, the sigmoid and the rectum were exteriorized to perform a sigmoid-rectal resection. Once pneumoperitoneum was reobtained, a Knight-Griffen end-to-end colorectal anastomosis was completed, after the transanal insertion of a 32 mm circular end-to-end anastomosis stapling device connected to a circular endoscopic anvil previously positioned. A temporary ileostomy was performed.

The operative time was 480 min with an intraoperative blood loss of 200 ml. The patient was discharged on the 8th day.

Forty-two days after surgery, DCBE confirmed that all three anastomoses were intact and ileostomy was converted by an end-to-end stapled anastomosis (Photo 3). Concurrently a laparoscopic second look was performed, showing a recurrent modest amount (250 ml) of ascites and a decrease in the Glisson’s capsule inflammation. At 48 months of follow-up, the patient was asymptomatic and no significant pelvic effusion was observed at ultrasound examination. All biochemical markers were normal; liver enzymes were not altered and no signs of malabsorption were observed.



Discussion



Intestinal endometriosis requiring bowel surgery is present in around one third of cases of severe endometriosis (revised ASRM stage IV) [3]. Surgical resection is required when an obstructive syndrome is present or suspected at the DCBE. The DCBE is considered positive in the presence of a mass effect on the large-bowel wall associated with indentation and ridging of the mucosa. This type of image seems to correspond to an infiltration of the whole muscularis in all cases and to an infiltration reaching the submucosa in 82% of cases [4]. Due to expressional decrease in both estrogen and progesterone receptors in the ectopic endometrium, the response to hormonal therapy may be compromised [5]. Moreover, endometriotic tissue in the bowel muscularis undergoes muscle cell hyperplasia and fibrosis, becoming resistant to medical treatment.

The extent of rectal surgery has evolved in clinical practice. Brouwer reported a recurrence rate for rectal endometriosis of 22.2% for dissection of the rectal wall, 5.2% for wall excision with a circular stapler and 2.2% for segmental resection [6]. Nodules > 2 cm or occupying more than one-third of the rectal circumference are suitable for segmental resection. In fact, lesions with circumference involvement > 40% are associated with an infiltration of the submucous or mucous layer of bowel and with lymph node involvement [7].

Major complications requiring further surgery are reported in 8.3% of patients who undergo bowel surgery for deep infiltrating endometriosis, whereas recto-vaginal and anastomotic fistulas are described in 3.2% and 1.1% of cases [8].

According to the literature, the pregnancy rate after laparoscopic colorectal resection ranges between 34% and 53.3% [9], being higher than after laparotomic resection (23.5–39.4%) [10]. It has been observed that the reproductive outcome improves if bowel resection is performed, leading to conception in 35% of patients (vs. 21% of patients without bowel resection), with a shorter interval to obtain a pregnancy (696 vs. 1417 days) [11]. The presence of bowel endometriosis negatively affects fertility, perhaps through obliteration of the pouch of Douglas.

Endometriosis is a heterogeneous disease that ranges in severity as well as manifestations. Involvement of extrapelvic organs is not uncommon. Ectopic endometrium has been found in addition to the gastrointestinal tract, in the urinary system, liver, spleen, diaphragm, pleural cavity, lung and pericardium [12]. Endometriosis can occur under a wide range of conditions mimicking bowel and urinary tract diseases but also malignancy. It is rarely associated with ascites. Less than 50 cases have been reported since the first case described in 1951 [13]. A large volume of ascites may be found and it always presents as a dark brown or hemorrhagic fluid. Sometimes an associated endometrioma is described but also normal ovaries at inspection are reported [14]. The cytological diagnosis of peritoneal endometriosis can be difficult since non-specific hemosiderin-laden or hemofuscin-laden macrophages may be the only cells identified [15]. Its pathophysiology is unclear but it can result from the rupture of endometriomas or, rarely, from hepatic involvement by cystic endometriosis. The hypothesis that endometrial cells shedding into the peritoneal cavity may irritate the peritoneum, thereby leading to ascites, is also widely accepted. The effectiveness of ovarian suppression therapy and bilateral ovariectomy is consistent with the hypothesis that the ovary is the origin of the massive ascites (similar to the Meigs syndrome). Whether ascites is due to endometriosis is debated, although the deep brown color suggests a causal relationship [16].



Conclusions



Therefore the suspicion of endometriosis is justified in young fertile women with suggestive clinical history, even in the presence of diagnostic and intraoperative findings mimicking neoplastic disease, and makes reasonable, in a referral center, an initial minimally invasive approach also in these borderline cases.

A laparoscopic approach to severe pelvic endometriosis with segmental bowel resection is feasible and achieves the same results in terms of outcome and quality of life compared with traditional open surgery with a lower complication rate [10]. In women with bowel symptomatic endometriosis, laparoscopic colorectal resection can be accomplished with a lower impact on fertility, compared to the laparotomic approach [10].

This kind of surgery is not free of severe complications, so it should be performed only in selected patients and in reference centers.



References



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Received: 26.09.2013, accepted: 5.11.2013.