Ascites and Encapsulating Peritonitis in Endometriosis: a Systematic Review with a Case Report

Endometriose com ascite e peritonite encapsulante: uma revisão sistemática com descrição de um caso clínico

Abstract

Endometriosis can have several different presentations, including overt ascites and peritonitis; increased awareness can improve diagnostic accuracy and patient outcomes. We aimto provide a systematic review and report a case of endometriosis with this unusual clinical presentation. The PubMed/MEDLINE database was systematically reviewed until October 2016. Women with histologically-proven endometriosis presenting with clinically significant ascites and/or frozen abdomen and/or encapsulating peritonitis were included; thosewith potentially confounding conditionswere excluded.Our search yielded 37 articles describing 42 women, all of reproductive age. Ascites was mostly hemorrhagic, recurrent and not predicted by cancer antigen 125 (CA-125) levels. In turn, dysmenorrhea, dyspareunia and infertility were not consistently reported. The treatment choices and outcomes were different across the studies, and are described in detail. Endometriosis should be a differential diagnosis of massive hemorrhagic ascites in women of reproductive age.

Keywords:
endometriosis; ascites; peritonitis; systematic review; treatment

Resumo

A endometriose pode ter várias apresentações, incluindo ascite e peritonite, que são apresentações incomuns. O aumento da conscientização sobre essa doença podemelhorar a precisão diagnóstica e os resultados das pacientes. Nosso objetivo é fornecer uma revisão sistemática e relatar um caso de endometriose com esta apresentação clínica incomum. O banco de dados PubMed/MEDLINE foi revisado sistematicamente até outubro de 2016. Foram incluídas mulheres comendometriosedemonstrada histologicamente, compresença de ascite clinicamente significativa e/ou abdômen congelado e/ou peritonite encapsulante; foram excluídas aquelas com comorbidades que pudessem provocar confusão. A pesquisa selecionou 37 artigos que descrevem42mulheres, todas emidade reprodutiva. A ascite foi principalmente hemorrágica, recorrente, e não indicada pelos níveis de antígeno associado ao câncer 125 (AC-125). Por sua vez, a dismenorreia, a dispareunia e a infertilidade não foram relatadas de forma consistente. As escolhas e os resultados do tratamento foram diferentes entre os estudos, e são descritos em detalhes. A endometriose deveria ser um diagnóstico diferencial de ascite hemorrágica maciça em mulheres em idade reprodutiva.

Palavras-chave:
endometriose; ascite; peritonite; revisão sistemática; tratamento

Introduction

Endometriosis is defined as the presence of endometrial tissue outside of the uterine cavity, which, like the eutopic endometrium, responds to hormonal stimuli.¹ Although the symptoms related to endometriosis may be associated with the location of the implant, they are unrelated to the extent of the disease, and a variety of clinical presentations have been described, including the presence of a small amount of peritoneal fluid.² It is very rare, however, for endometriosis to present as overt ascites, and the presence of such a condition should prompt the investigation of differential diagnoses, such as malignancy.³ The occurrence of encapsulating peritonitis, described as the encapsulation of bowel loops by a thick fibrinogenous case, is even rarer, with only five cases previously described in the medical literature.^{3 4 5 6 7 8}

Women who present with ascites due to endometriosis often undergo multiple diagnostic procedures, including invasive ones, before the underlying cause for ascites is found.⁹ This results in increased patient risks and health care costs.¹⁰ General and emergency physicians, as well as gynecologists, should be aware of endometriosis as a potential cause of ascites and encapsulating peritonitis to promptly diagnose it.

With this in mind, this study aims to bring attention to the case of a woman presenting with encapsulating peritonitis and multiple episodes of massive ascites. We also provide a systematic review of the literature regarding the association between histologically-proven endometriosis and clinically-significant ascites, frozen abdomen or encapsulating peritonitis, including detailed characteristics of their presentations, proposed treatments and outcomes.

Methods

For this systematic review, we used the protocol outlined by the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) Statement (Fig. 1). The electronic PubMed database was searched until October 2016 using the detailed strategy described in Table 1. The case of a woman with endometriosis, recurrent ascites and encapsulating peritonitis observed at our clinic is also described. The review has been approved by the Ethics in Research Committee under the protocol number 006.01.2017.

Table 1
Detailed search strategy used in the advanced tool of the PubMed/MEDLINE database

Search	Keywords
#1	peritoneal fibrosis OR encapsulating peritoneal sclerosis OR sclerosing encapsulating peritonitis OR abdominal cocoon OR frozen abdomen OR ascites
#2	endometriosis OR endometrioma OR endometriotic OR hemosiderophage
Final search	#1 AND #2

Fig. 1
Flow diagram describing the steps in the study selection for inclusion in this systematic review.

Eligibility Criteria

Original articles, clinical trials, case series and case reports of women of any age with histologically-proven endometriosis, presenting with clinically significant ascites and/or frozen abdomen and/or encapsulating peritonitis, published in English, Portuguese, French or Spanish, were eligible for this review.

Because other causes that may occur concurrently with endometriosis can cause the clinical presentations described, we excluded papers describing patients with: cancer of the ovaries, appendix or peritoneum, or other intra-abdominal cancers; tuberculosis; ovarian hyperstimulation syndrome; ovarian induction or other known causes of massive ascites; and ascites beginning in the immediate or early post-operative period of exploratory laparotomy/laparoscopy. Animal studies; articles published in languages other than the aforementioned ones; and reviews of the literature were also excluded.

Study Selection

The references retrieved were independently screened by two investigators, KA and TM. Initially, the screening was made by title and abstract; then, the full-text versions of the selected papers were obtained, and each article was reviewed for final inclusion. If a consensus could not be reached, another author (LB) made the final decision regarding inclusion.

Data Extraction

A standardized table was used for data extraction on each selected paper, and information regarding the first author, the country of origin, the journal and year of publication, the study type, patient/sample age, patient origin or ethnicity, the clinical presentation, the proposed treatment, and the outcome were included. The characteristics of the ascitic fluid and data regarding the presence or absence of encapsulating peritonitis were also recorded. Data extraction was performed independently by two investigators (KA and TM).

Case Description

A 28-year-old woman presented to the internal medicine clinic at our institution with wasting syndrome, increased abdominal girth, progressive shortness of breath, dark stools and decreased appetite. She also complained of progressive abdominal and thoracic pain during menses, as well as cyclic dyspareunia that had started five years before. She denied infertility or any other chronic medical conditions. Her cancer antigen 125 (CA-125) values were 107.8 and 889.6 on two measurements performed when she was an internal medicine inpatient.

Abdominal ultrasound and contrasted computed tomography (CT) studies showed loculated, cystic-like ascites producing a mass effect. A paracentesis procedure revealed a thick, hemorrhagic fluid with low albumin, high cellularity and large concentration of red blood cells (Fig. 2). The fluid analysis was negative for bacterial growth or cancer cells. During the diagnostic laparoscopy, multiple adhesions and peritoneal lesions were noticed, and the patient's abdomen was described as “frozen,” due to the presence of encapsulating peritonitis, which did not enable the separation of the peritoneal layers and the confection of the pneumoperitoneum. Eight liters of fluid were removed. Histopathology of a peritoneal biopsy taken at this time described chronic peritonitis and scarce hemosiderin deposits.

Fig. 2
Thick, hemorrhagic ascitic fluid sample.

One month after the initial imaging exam, another contrasted abdominal CT suggested the presence of sclerosing encapsulating peritonitis (Fig. 3). At this point, the patient was referred to our gynecology clinic due to suspected endometriosis. This diagnosis was further suggested by a gynecological exam, ultrasound mapping and a magnetic resonance imaging (MRI) scan, which showed evidence of fibrosis in the anterior vaginal fornix, multiple peritoneal nodules, and apparently hemorrhagic bilateral ovarian cysts. The chest CT and the colonoscopy at that time were normal.

Fig. 3
Contrasted computed tomography (CT) showing massive ascites, centrally encased bowels, and thickened peritoneum.

A new laparoscopy was performed, and a biopsy confirmed the diagnosis of endometriosis. Due to peritoneal adhesions, it was not possible to access the pelvic and abdominal organs. This patient was treated with goserelin acetate, with good clinical response. At the six-month follow-up, she was asymptomatic and had regained a considerable amount of weight.

Results

Study Characteristics

Our systematic review yielded 37 articles describing 42 patients with clinically significant ascites, encapsulating peritonitis, or frozen abdomen. One author had a series of three cases, while another had a series of four cases; all of the remaining articles reported only one case each.^{11 12} The publication dates ranged from 1978 to 2016.

Patient Characteristics and Clinical Presentation

The ages of the women who fulfilled the eligibility criteria ranged from 20 years to 47 years.^{13 14}

A total of 8 women in the included articles were described as “black”; 3, as “African-American”; and 2, as “Afro-Caribbean.”^{12 13 15 16 17 18 19 20 21 22} One patient described herself as “African;” another patient, as “caucasian;” a third one, as “Hispanic;” and another one, as “negro.”^{23 24 25 26} Seven studies did not describe ethnicity, but reported that the patients were Nigerian (n= 3), Malay (n= 2), Brazilian (n= 1) or Japanese (n= 1).^{3 6 8 27 28 29 30} Ethnicity or origin was not described at all for the remaining 16 patients.^{5 7 11 14 31 32 33 34 35 36 37 38 39 40 41 42}

The ascites was of acute onset in 8 women, and gradual in 24 patients (Supplementary Material 1). The type of onset was not reported in six cases.

In most patients, the ascites was described as “hemorrhagic” and “recurrent,” but descriptions such as “yellow,” “clear yellow,” “brownish green” and “loculated” were also observed.^{3 6 8 13 25 32 33} Ascites was present but not characterized in five cases.^{5 14 15 19 34}

The volume of ascitic fluid was not shown in some studies, but there are reports of 4.2 L, 4.8 L, 5.0 L and 7 L.^{13 29 36 41} There was associated pleural effusion in eleven patients.^{3 12 18 19 21 23 32 33 40} Liver involvement by endometriosis was cited in four cases, including one with cysts and another with non-specified focal lesions.^{3 34}

Twenty-two articles reported CA-125 levels. Normal levels were observed in six patients. The biomarker was elevated (> 35 U/mL) in 14 patients, ranging from 49 U/mL to > 5,000 U/mL. One case had normal CA-125 levels at first, but they became elevated (455 U/mL) after ascites recurrence.¹²

The most common main clinical presentation was abdominal distension, which was sometimes accompanied by other symptoms such as abdominal pain, abdominal tenderness, abdominal mass, shortness of breath, signs of hypovolemia, weight loss, nausea or vomiting, asthenia, malaise, cachexia or loss of appetite. In 25 of the 42 women described, at least one symptom of the classic dysmenorrhea, dyspareunia and infertility triad was reported. Of these, dysmenorrhea was the most common, and it was reported in 20 women.^{8 11 12 13 15 16 18 20 22 23 24 27 30 31 32 36 38 39 40 41} Infertility was reported in 11 patients.^{11 18 19 22 23 24 29 30 31 40 41} Dyspareunia was reported in 4 patients.^{15 22 24 36} All three symptoms were present in two studies.^{22 24} However, in 15 articles (describing 17 patients), the presence or absence of dysmenorrhea was not mentioned at all.^{5 6 7 12 14 19 21 25 26 28 29 33 34 35 37} A total of 33 studies (with 38 patients) were regarding the presence or absence of dyspareunia,^{3 5 6 7 8 11 12 13 14 16 17 18 19 20 21 25 26 27 28 29 30 31 32 33 34 35 37 38 39 40 41 42} and 25 studies (with 28 patients) were regarding the presence or absence of infertility.^{3 5 6 7 8 11 12 13 14 15 16 17 21 25 26 27 28 32 33 34 35 36 37 38 39} Fifteen articles did not mention if any of these three symptoms were present or absent in the cases they reported.^{5 6 7 12 14 21 25 26 28 33 34 35 37}

Besides our patient, only five cases of encapsulating peritonitis due to endometriosis have been described in the medical literature.^{3 5 6 7 8}

Treatments Used and Outcomes

The treatment choices for the patients included in this review involved hormonal therapies, surgery, anti-inflammatory drugs (steroidal or non-steroidal) or a combination of them. Ascites recurrence or persistence was frequent. Three articles did not report how the patients were managed (Table 2).^{3 14 35}

Table 2
Treatment choices and respective outcomes in each study. Outcomes written as described in each article

	Treatment for ascites	Outcome
Dun et al, 201629	Leuprolide + oral norethindrone	Ascites persisted
	Laparoscopic evacuation of ascites and excision of endometriosis	No recurrence (6-month follow-up)
Hasdemir et al, 201540	Leuprorelin acetate for 6 months	Resolution of symptoms until 2 months after cessation
	Dienogest	Resolution of symptoms (3-month follow-up)
Hinduja et al, 201642	Leuprolide 3.75 mg monthly	Recurrence after 6 months
	TAH + BSO	Ascitic fluid leakage through vaginal suture line (10 days after the operation)
	Short-acting GnRH agonist + oral danazol followed by GnRH only	No recurrence (1-year follow-up)
Setubal et al, 201524	Continuous OCP for 3 months	Ascites persisted
	GnRH agonist, then laparoscopic excision of lesions followed by GnRH agonist	Minimal ascites
	Underwent IVF protocol	Minimal ascites
	OCP	Symptom-free
Appleby et al, 201428	GnRH antagonist	No recurrence (6-month follow-up)
Asano et al, 201430	GnRH agonist	Ascites recurred
	Oral dienogest	No recurrence (1-year follow-up)
Bignall et al, 201422	GnRH agonists	Ascites recurred
	GnRH agonists + tibolone + NSAIDs + pregabalin	Symptoms well-controlled
Cosma et al, 201441	Laparoscopic excision of lesions	Modest recurrence (250 mL) after 42 days
Shabeerali et al, 201211	CASE 1: GnRH analogue	No recurrence (6-month follow-up)
	CASE 2: Subtotal abdominal hysterectomy + BSO	No recurrence (1-year follow-up)
	CASE 3: GnRH analogues for 1 year; then, TAH + BSO	Partial response; then, relatively asymptomatic at 1-year follow-up
Ferrero and Remorgida, 201136	Norethindrone acetate (25 mg daily)	No recurrence (1-year follow-up)
Ignacio et al, 201018	GnRH analogue	No recurrence (8-month follow-up)
Lin et al, 201037	Laparoscopic electrocauterization of lesions	Condition stabilized
Suchetha et al, 20107	GnRH analogues for 1 year	Good response
Park et al, 200939	Laparoscopic excision of endometrioma + GnRH agonist for 6 months + tibolone	No recurrence (1-year follow-up)
Sait, 200838	Bilateral ovarian cystectomies + GnRH analogue for 6 months followed by OCP	No recurrence (2-year follow-up)
Santos et al, 20076	Laparoscopy + laparotomy	NR. Patient died after 5 months
Palayekar et al, 200720	TAH + BSO	No recurrence (1-year follow-up)
Fortier et al, 200523	Ovarian cystectomy + GnRH analogue for 6 months + laparoscopic excision of lesions + oral progesterone for 6 months	Two recurrences
	Ceased treatment and started clomiphene due to pregnancy desire	Ascites recurrence
	GnRH for 2 months	Ascites recurrence
	GnRH for 6 months	Ascites recurrence
Mohd Noor et al, 20048	Laparotomy + excision of lesions	No recurrence (4-week follow-up)
Zeppa et al, 200435	NR	NR
Cheong and Lim, 20033	NR	NR
Jeanes et al, 200234	Double hysterectomy + left oophorectomy followed by estradiol for 6 months followed by goserelin	No recurrence (3-year follow-up)
Moffatt and Mitchell, 200219	Leuprolide + premarin	Recurrence after 4 weeks
	TAH + BSO + leuprolide	No recurrence (9-month follow-up)
Bhojawala et al, 200017	TAH + RSO	No recurrence (6-week follow-up)
Samora-Mata and Feste, 199925	TAH + RSO	NR
Myneyyirci-Delale et al, 199812	Laparoscopic excision of lesions followed by GnRH agonist for 6 months; then, excision of new ovarian cyst + danazol daily for 6 months followed by norethindrone acetate	Recurrence after 1 year; then, no recurrence (3-year follow-up)
	Laparotomy + monthly depo provera injections; then, TAH + BSO	Recurrence after 3 years; then, no recurrence (6-month follow-up)
	Appendectomy and left ovarian wedge resection + lupron	No recurrence
	Lysis of adhesions + LSO followed by lupron followed by norethindrone acetate	NR
Frigerio et al, 19975	TAH + BSO + appendectomy + omentectomy	No recurrence (3-year follow-up)
Mejia et al, 199716	Laparotomy	No recurrence (15-month follow-up)
Flanagan and Barnes, 199621	Laparotomy + GnRH agonist for 6 months	Recurrence (twice in 1 year)
	Prednisolone 30 mg daily	Recurrence
	Leuprorelin for 5 months	Recurrence
Myers et al, 199533	TAH + BSO + lysis of adhesions	No recurrence (8-month follow-up)
Jose et al, 199432	LSO	Recurrence after 1 year
	Laparotomy + danazol	NR
Schlueter an McClennan, 199413	Leuprolide acetate monthly	No recurrence (3-month follow-up)
Williams and Wagaman, 199115	Medroxyprogesterone acetate	Recurrence after 1 month
	Depot lupron for 3 months	Some ascites
	TAH + BSO	Recurrence after 3 months
	Tenckhoff catheter placed for 2 weeks	No recurrence (9-month follow-up)
Chichareon and Wattanakitkrailert, 198831	TAH + BSO	No recurrence (6-month follow-up)
Olubuyide et al, 198827	Oral norethisterone	No recurrence (1-year follow-up)
Naraynsingh et al, 198526	Depo provera for 6 months	No recurrence (4-year follow-up)
Cantor et al, 197914	NR	NR

• Abbreviations: BSO, bilateral salpingo-oophorectomy; GnRH, gonadotropin-releasing hormone; IVF, in vitro fertilization; LSO, left salpingo-oophorectomy; NR, not reported; NSAIDs, non-steroidal anti-inflammatory drugs; OCP, oral contraceptive pills; RSO, right salpingo-oophorectomy; TAH, total abdominal hysterectomy.

The hormonal therapies used included long-acting gonadotropin-releasing hormone (GnRH) agonists (namely goserelin and leuprolide), short-acting GnRH agonists, GnRH antagonists, progestational hormones (specifically dienogest, medroxyprogesterone and norethindrone), estradiol, conjugated estrogens, synthetic combined hormones (namely tibolone), steroids with antigonadotropic and anti-estrogenic activity (danazol), and oral contraceptive pills (OCPs).

Other conservative treatments used were isolated prednisolone, which did not prevent ascites recurrence, and nonsteroidal anti-inflammatory drugs (NSAIDs) in combination with pregabalin and hormonal therapies, which were effective in controlling the symptoms.

The surgical procedures involved drainage of the ascites, excision or electrocauterization of the endometriotic lesions through laparotomy or laparoscopy, lysis of adhesions, abdominal hysterectomy, uni- or bilateral salpingo-oophorectomy, ovarian cystectomy, omentectomy, appendectomy, placement of Tenckhoff catheter and/or ovarian wedge resection.

After the initial treatment, due to the desire to achieve pregnancy, one woman underwent in vitro fertilization (IVF), with minimal ascites afterwards.²⁴ Another patient started clomiphene, with ascites recurrence.²³

A summary of the treatments used for ascites and its respective outcomes, including the time until recurrence, is shown in Table 2.

Discussion

All patients shown in this review were of childbearing age, likely due to hormonal levels and occurrence of menses. This is, indeed, the most common age range for the presentation of endometriosis in general, which can also rarely occur in older women.⁴³ Endometriosis most commonly affected women of African descent, but it was present in patients of multiple other ethnicities, implying that this diagnosis should not be restricted to patient origin, and must be suspected if the clinical presentation is suitable.

Fluid accumulation was most commonly progressive, but acute onset of symptoms has also been described. The reasons for such a presentation remain unclear, but can be related to the rapid accumulation of fluid and to the spontaneous rupture of a cyst.³⁷

Endometriosis-associated ascites is rare, and encapsulating peritonitis is even less common. Since we excluded women with potentially confounding conditions, it appears that endometriosis itself is the cause of such clinical presentations. It has been hypothesized that the peritoneal irritation caused by endometriosis results in extensive fibrosis and inflammation, further optimizing the microenvironment for more secondary implants, which in turn exacerbate inflammation. In fact, this theory could also explain the high rate of recurrence of ascites due to endometriosis (Table 2), ultimately resulting in encapsulating peritonitis, which is described in our case and in four other ones.

Abdominal distension related to ascites was the most common clinical sign, but non-specific signs and symptoms such as malaise and weight loss were also described (Supplementary Material 1). Additionally, most women had symptoms suggestive of endometriosis, but these were not always reported, bringing attention to the high level of suspicion needed to diagnose this condition. Not all women present with classic symptoms; however, in order for diagnostic accuracy to be improved, physicians in general (including emergency room physicians) need to ask about them specifically during history-taking.

Moreover, in some cases, ascitic volume was large and related to pleural effusion, resembling Meigs syndrome. Great volumes can be caused by the rapid production of fluid, in association with the obstruction of subdiaphragmatic lymph vessels. In turn, pleural fluid may be due to the transdiaphragmatic flow of ascites through the lymphatic channels, as has been proposed by Meigs et al,⁴⁴ or due to local reactive inflammation.³⁸

The fluid was generally hemorrhagic, but could have different aspects, such as clear yellow or green-brownish color. On this matter, Bernstein proposed a mechanism by which chocolate cysts would rupture into the peritoneal cavity, leading to irritation and ascites formation; correspondingly, other explanations relate to excessive ovarian transudation, superficial endometriosis, open endometriosis lesions or angiogenesis.^{45 46 47}

Part of the included studies also measured and reported serum CA-125 levels. This biomarker is known to not be accurate for the diagnosis of endometriosis in general; likewise, it was not reliable in the diagnosis of endometriosis presenting with ascites. Although no statistical comparisons were made, it is clear that the values were not intimately correlated to the characteristics of ascites. Furthermore, endometriosis caused CA-125 levels > 5,000 U/mL in one case, which commonly indicates malignancy; this further contributes to the need of including endometriosis in the list of differentials of suspected malignancies due to massive ascites.

Several treatment choices were observed in the included articles; the options were similar to the therapies available for endometriosis in general. For the specific treatment of women presenting with ascites, no specific protocol exists, and empirical data does not evidently favor one therapy over another (Table 2).

Among the strengths of our review are the fact that only articles with histologically proven endometriosis were selected; the exclusion of patients with conditions that commonly cause ascites; and the systematic approach. It is limited, however, in that articles in only four languages were included, and in the fact that some older articles initially screened could not be included because they were not available online, even for purchase. Further research is needed to better define optimal diagnostic and therapeutic approaches in women with unusual presentations of endometriosis.

Conclusion

Clinically significant ascites, frozen abdomen and/or encapsulating peritonitis related to endometriosis are rare conditions. It can present with abdominal distension, symptoms classically related to endometriosis, and other non-specific symptoms. The clinical presentations were heterogeneous. Endometriosis should be a differential diagnosis of massive hemorrhagic ascites in women of reproductive age, but the exclusion of other potential causes, especially malignancy, is needed for the diagnosis of this condition. The treatment options include hormonal therapy, anti-inflammatory drugs and/or surgery. There are no specific protocols for the treatment of this condition.

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Publication Dates

• Publication in this collection
  Mar 2018

History

• Received
  12 Sept 2017
• Accepted
  20 Dec 2017