Intestinal Obstruction due to Endometriosis Involving Atypical Hyperplasia : A Case Report

C l i n M e d International Library Citation: Senturk MB, Guraslan H, Babaoğlu B, Polat M (2015) Intestinal Obstruction due to Endometriosis Involving Atypical Hyperplasia: A Case Report. Obstet Gynecol Cases Rev 2:051 Received: June 26, 2015: Accepted: July 21, 2015: Published: July 24, 2015 Copyright: © 2015 Senturk MB. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Senturk et al. Obstet Gynecol cases Rev 2015, 2:4


Introduction
Approximately 15%-37% of patients with endometriosis have intestinal involvement [1][2][3].The majority of these are located in the recto-sigmoid (65.7%) and sigmoid (17.4%) [4].Particularly, if a mass has formed in these regions or if intestinal mucosa has been reached, an emergency clinical table may be seen such as abdominal pain, rectal bleeding, diarrhea and occasionally intussusception and ileus [5][6][7].When the mass grows and the area of involvement intensifies, even though it is rare, precancerous or cancerous changes may be seen [8].
The clinical case is here presented of a patient who underwent emergent laparotomy because of intestinal obstruction.

Case
A 39-year old gravida 3 patient who presented with complaints of nausea, vomiting and no discharge of faeces or gas for 2 days was admitted to the emergency clinic with an initial diagnosis of ileus.The patient had previously been operated on for ovarian endometrioma at another clinic and was being followed up for pain associated with endometriosis.On the tomography image, a mass, 3.5-4.5cm in diameter, was observed in the recto-sigmoid region obliterating the lumen.In addition, proximal to this mass, the colon reached a diameter of 8cm.The preoperative haemogram and full urine test biochemistry values were examined.The patient was admitted salpingo-oopherectomy.In 3 of these patients, adenocarcinoma developed; adenocarcinoma in situ in 1, atypical endometrial hyperplasia in 2, adenosarcoma in 1 and adenofibroma showing borderline malignancy in 1.It was reported that unopposed estrogen had a potential effect on the development of precancerous or cancerous lesions in endometriotic foci and pathologists should take this into account when examining endometriotic foci.
Endometriosis may be accompanied by clear cell ovarian cancer at a rate of 30-40% and high grade serous ovarian carcinoma at less than 10% [24].Endometriotic tissue adjacent or attached to endometriotic tissue of normal appearance may hold cytologically atypical or obvious cancer tissue.Good evidence showing the relationship between this endometriosis and cancer has also reported a molecular and genetic relationship.The mutation causing loss of function of the ARID 1A gene has been seen in foci as atypical and cancer tissue together [25,26].In addition, the CTNNB1 gene mutation has been reported in tissue formed of clear cell carcinoma, endometriotic ovarian carcinoma and atypical endometriosis together [27].Furthermore, in atypical endometriosis tissue which is included in carcinoma tissue, endometrial receptor expression continues and HNF 1B gene expression is reduced [27].
Sometimes difficulties may be encountered in the differential diagnosis of neoplasm occurring in the endometrial tissue from neoplasm originating in the epithelium or gastrointestinal normal mucosa.This differentiation is even more difficult in masses which have extended into the lumen, therefore awareness of these types of lesions and careful examination by pathologists is important.Masses which are under the endometriosis support endometriotic adenocarcinoma, while atrophic gland and stroma may develop due to excessive growth of the lesion and neoplastic tissue may be seen [8].The location of the neoplastic tissue may be helpful in the differential diagnosis.Primary colonic cancer always involves the mucosa.When there are coexisting adenomatous changes in the mucosa, and are often associated with adenomatous changes or a neoplastic polyp in the adjacent epithelium [8].
Preneoplastic or neoplastic changes with intestinal pathologies of endometriosis are extremely rare.Apart from the ovary, the area of most involvement is the colon and therefore symptoms often mimic colon diseases.Thus, a multidisciplinary approach with general surgeons is required for clinicians for the diagnosis and treatment of colonic endometriosis.In addition, careful microscopic examination must be made of the resected material, particularly in cases with a large or widespread mass.hyperplasia in focal areas.On the posterior surface of the uterus, focal endometriotic tissue was observed and findings were seen of endometrium delayed secretion.In accordance with the decision of the general surgeon, the colostomy was closed after 2 weeks and endto-end anastomosis was applied.

Discussion
Since the first report of malignant transformation in ovarian endometriosis by Sampson [10], there have been several reports on the malignant transformation of an endometriosis focal point [11][12][13].The majority of endometriosis cases involve serosal surfaces in the gastrointestinal system.As there are few studies in literature on the relationship between the size of the mass in intestinal endometriosis and malignant transformation, there is a need for studies on this subject [8,[14][15][16].
In the majority of patients with these lesions, changes in intestinal habits, rectal bleeding, abdominal cramps or vaginal bleeding may be seen [8].However, the number of cases presenting with an emergency clinical table such as intussusception or intestinal obstruction is extremely low [5,7,8,17,18].Aronchick et al. [14] reported the first case of endometriosis who presented with ileocolic intussusception and bleeding.Then Deneve et al. [19] presented the case of a 43year old patient with non-reductable ileocolic intussusception and obstruction.In the majority of endometriosis showing subserosal location, especially when the muscle layer has started to be invaded, colonic passage is slowed by impairment of colon peristalsis.Together with transmural involvement, adhesion caused by significant inflammation may result in mural fibrosis with obstruction [5].In addition, the mass formation caused by endometriosis may cause an obstruction in the lumen by extending in a polypoid way towards the lumen interior [5,14,15,20,21].In the current case, the transmural involvement together with extension into the lumen had caused the obstruction.Yantiss et al. [8] reported a series of 17 patients including 2 patients determined with endometrial hyperplasia.One of these patients presented with intestinal habit dysfunction and the other with obstruction.Both patients were observed to have a 3.5cm mass and in the patient with obstruction, the mass in the sigmoid colon had destroyed the mucosa, as in the current case.
It is well known that exogenous estrogen treatment can cause precancerous or cancerous lesions in endometriotic tissue [22].There have been previous reports on the relationship between estrogen treatment and precancerous or cancerous lesions in gastrointestinal endometriotic foci.Dunn et al. [23] presented a case of endometrioid adenocarcinoma in the ovarian endometriosis of a postmenopausal patient taking tamoxifen for breast cancer.In a report by Yantiss et al. [8], 8 of 17 cases had previously taken unopposed estrogen and had previously undergone total abdominal hysterectomy and bilateral

Figure 1 :
Figure 1: Appearances of the endometriotic tissue in the bowel