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Genitourinary endometriosis: Diagnosis and management: Early recognition of this rare but potentially devastating disorder is essential to facilitate effective management and optimal outcomes for patients.

Endometriosis is a benign disease characterized by endometrial glands and stroma outside of the uterine cavity. It is commonly associated with pelvic pain and infertility. Ectopic endometrial tissue is predominantly located in the pelvis, but it can appear anywhere in the body, where it is referred to as extragenital endometriosis. The bowel and urinary tract are the most common sites of extragenital endometriosis. (1)

Laparoscopic management of extragenital endometriosis has been described since the 1980s. (2) However, laparoscopic management of genitourinary endometriosis is still not widespread. (3,4) Physicians are often unfamiliar with the signs and symptoms of genitourinary endometriosis and fail to consider it when a patient presents with bladder pain or hematuria, which may or may not be cyclic. Furthermore, many gynecologists do not have the experience to correctly identify the various forms of endometriosis that may appear on the pelvic organ, including the serosa and peritoneum, as variable colored spots, blebs, lesions, or adhesions. Many surgeons are also not adequately trained in the advanced laparoscopic techniques required to treat genitourinary endometriosis. (4)

In this article, we describe the clinical presentation and diagnosis of genitourinary endometriosis and discuss laparoscopic management strategies with and without robotic assistance.

Clinical presentation and diagnosis of genitourinary endometriosis

While ureteral and bladder endometriosis are both diseases of the urinary tract, they are not always found together in the same patient. The bladder is the most commonly affected organ, followed by the ureter and kidney. (3,5,6) Endometriosis of the bladder usually presents with significant lower urinary tract symptoms. In contrast, ureteral endometriosis is usually silent with no apparent urinary symptoms.

Ureteral endometriosis. Cyclic hematuria is present in less than 15% of patients with ureteral endometriosis. Some patients experience cyclic, nonspecific colicky flank pain. (7-9) Otherwise, most patients present with the usual symptoms of endometriosis, such as pelvic pain and dysmenorrhea. In a systematic review, Cavaco-Gomes and colleagues described 700 patients with ureteral endometriosis; 81% reported dysmenorrhea, 70% had pelvic pain, and 66% had dyspareunia. (10) Rarely, ureteral endometriosis can result in silent kidney loss if the ureter becomes severely obstructed without treatment. (11,12)

The lack of symptoms makes the early diagnosis of ureteral endometriosis difficult. As with all types of endometriosis, histologic evaluation of a biopsy sample is diagnostic. Multiple imaging modalities have been used to preoperatively diagnose ureteral involvement, including computed tomography, (13) magnetic resonance imaging (MRI), (14) intravenous pyelogram (IVP), and pelvic ultrasonography. However, each of these imaging modalities is limited in both sensitivity and the ability to characterize depth of tissue invasion.

In a study of 245 women undergoing pelvic ultrasonography, Pateman and colleagues reported that an experienced sonographer was able to visualize the bilateral ureters in 93% of cases. (15) Renal ultrasonography is indicated in any woman suspected of having genitourinary tract involvement with the degree of hydroureter and level of obstruction noted during the exam. (16)

In our group, we perform renography to assess kidney function when hydroureter is noted preoperatively. Studies suggest that if greater than 10% of normal glomerular filtration rate remains, the kidney is considered salvageable, and near-normal function often returns following resection of disease. If preoperative kidney function is noted to be less than 10%, consultation with a nephrologist for possible nephrectomy is warranted.

We find that IVP is often helpful for preoperatively identifying the level and degree of ureteral involvement, and it also can be used postoperatively to evaluate for ureteral continuity (FIGURE 1). Sillou and colleagues showed MRI to be adequately sensitive for the detection of intrinsic ureteral endometriosis, but they reported that MRI often overestimates the frequency of disease. (17) Authors of a 2016 Cochrane review of imaging modalities for endometriosis, including 4,807 women in 49 studies, reported that no imaging test was superior to surgery for diagnosing endometriosis. (18) However, the review notably excluded genitourinary tract endometriosis, as surgery is not an acceptable reference standard, given that many surgeons cannot reliably identify such lesions. (18)

Bladder endometriosis. Unlike patients with ureteral endometriosis, those with bladder endometriosis are typically symptomatic and experience dysuria, hematuria, urinary frequency, and suprapubic tenderness. (7,19) Urinary tract infection, interstitial cystitis, and cancer must be considered in the differential diagnosis. Urinalysis and urine culture should be performed, and other diagnostic procedures such as ultrasonography, MRI, and cystoscopy should be considered to evaluate for endometriosis of the bladder.

Ultrasound and MRI of the bladder both demonstrate a high specificity for detecting bladder endometriosis, but they lack sensitivity for lesions less than 3 cm. (20) Deep infiltrating endometriosis of the bladder can be identified at the time of cystoscopy, which can assist in determining the need for ureteroneocystostomy if lesions are within 2 cm of the urethral opening. (20) Cystoscopy also allows for biopsy to be performed if underlying malignancy is of concern. (19)

In our group, when bladder endometriosis is suspected, we routinely perform preoperative bladder ultrasonography to identify the lesion and plan to perform intraoperative cystoscopy at the time of laparoscopic resection. (19,21)


Medical management

Empiric medical therapies for endometriosis are centered around the idea that ectopic endometrial tissue responds to treatment in a similar manner as normal eutopic endometrium. The goals of treatment are to reduce or eliminate cyclic menstruation, thereby decreasing peritoneal seeding and suppressing the growth and activity of established ectopic implants. Medical therapy commonly involves the use of gonadotropin-releasing hormone agonists or antagonists, danazol, combined oral contraceptives, progestins, and aromatase inhibitors.

Medical therapy is commonly employed for patients with mild or early-stage disease and in those who are poor surgical candidates or decline surgery. Medical management alone clearly is contraindicated in the setting of ureteral obstruction and--in our opinion--may not be a good option for those with endometriosis of the ureter, given the potential for recurrence and potential serious sequelae of reduced renal function.22 Therefore, surgery has become the standard approach to therapy for mild to moderate cases of ureteral endometriosis. (3)

Medical therapy for patients with endometriosis of the bladder is generally considered a temporary solution as hormonal suppression, with its associated adverse effects, must be maintained throughout menopause. However, if endometriosis lesions lie within close proximity to the trigone, medical management is preferred, as surgical excision in the area of the trigone may predispose patients to neurogenic bladder and retrograde bladder reflux. (23,24)

Surgical management

The objectives of surgical treatment for genitourinary tract endometriosis are to excise all visible disease, to prevent or delay recurrence of the disease to the extent possible, and to avoid any further morbidity--in particular, to preserve renal function in cases of ureteral endometriosis--and to avoid iatrogenic injury to surrounding pelvic nervous structures (25-27) (FIGURE 2). The surgical approach depends on the technical expertise of the surgeon and the availability of necessary instrumentation. In our experience, laparoscopy with or without robotic assistance is the preferred surgical approach. (3,4,6,11,28-32)

Others have reported on the benefits of laparoscopy over laparotomy for the surgical management of genitourinary endometriosis. In a review of 61 patients who underwent either robot-assisted laparoscopic (n = 25) or open (n = 41) ureteroneocystostomy (n = 41), Isac and colleagues reported the procedure was longer in the laparoscopic group (279 min vs 200 min, P<.001), but the laparoscopic group had a shorter hospital stay (3 days vs 5 days, P<.001), used fewer narcotics postoperatively (P<.001), and had lower intraoperative blood loss (100 mL vs 150 mL, P<.001). (32) No differences in long-term outcomes were observed in either cohort.

In a systematic review of 700 patients undergoing laparoscopic surgery for ureteral endometriosis, Cavaco-Gomes and colleagues reported that conversion to laparotomy occurred in only 3% to 7% of cases. (10) In instances of ureteral endometriosis, laparoscopy provides greater visualization of the intraperitoneal contents over laparotomy, enabling better evaluation and treatment of lesions. (3,29,33,34) Robot-assisted laparoscopy provides the additional advantages of 3D visualization, potential for an accelerated learning curve over traditional laparoscopy, improvement in dissection technique, and ease of sumring technique. (6,35,36)

Extrinsic disease. In our group, we perform ureterolysis for extrinsic disease. (25) The peritoneal incision is made in an area unaffected by endometriosis. Using the suction irrigator, a potential space is developed under the serosa of the ureter by injecting normal saline or lactated Ringer's solution. By creating a fluid barrier between the serosa and underlying tissues, the depth of surgical incision and lateral thermal spread are minimized. Grasping forceps are used to peel the peritoneum away. (25,37,38)

Intrinsic disease. Unlike extrinsic disease, intrinsic disease can infiltrate the muscularis, lamina propria, and ureteral lumen, resulting in proximal dilation of the ureter with strictures. (8) In this situation, ureteral compromise is likely and resection of the ureter is indicated (3,28) (FIGURE 3). Intrinsic disease can be suggested by preoperative imaging or when there is evidence of deep infiltrating disease on physical exam, such as rectovaginal nodularity. (30,39) When intrinsic ureteral disease is known, consultation with a urologist to plan a joint procedure is advisable. The procedure chosen to re-establish a functional ureter following resection depends on the location and extent of the involved ureter. Resection in close proximity to the bladder may be repaired by ureteroneocystostomy with or without psoas hitch, (30,39,40) whereas resection of more proximal ureter may be repaired using Boari flap, ileal interposition, or auto-transplantation. Lesions in the upper third or middle ureter may be repaired using ureterouretral anastomosis. (6,7,30,41,43)

Bladder endometriosis. Surgical treatment for bladder endometriosis depends on the depth of invasion and the location of the lesion (FIGURE 4). Lesions of the superficial aspect of the bladder identified at the time of laparoscopy can be treated with either excision or fulguration. (28,35,44) In our group, we perform excision over fulguration to remove the entire lesion and obtain a pathologic diagnosis. Deeper lesions involving the detrusor muscle are likely to be an endometrioma of the bladder. In these cases, laparoscopic excision is recommended. (7) Rarely, lesions close to the interureteric ridge may require ureteroneocystostomy. (19,45)

In our experience, laparoscopic resection of bladder endometriomas is associated with better results in terms of symptom relief, progression of disease, and recurrence risk compared with other approaches. When performing laparoscopic excision of bladder lesions, we concomitantly evaluate the bladder lesion via cystoscopy to ensure adequate margins are obtained. Double-J stent placement is advised when lesions are within 2 cm of the urethral meatus to ensure ureteral patency during the postoperative period. (45) A postoperative cystogram routinely is performed 7 to 14 days after surgery to ensure adequate repair prior to removing the urinary catheter. (9,25,46,47)

Postsurgical follow-up

Follow-up after treatment of genitourinary tract endometriosis should include monitoring the patient for symptoms of recurrence. Regular history and physical examination, renal function testing, and, in some instances, pelvic ultrasonography, all have a role in surveillance for recurrent ureteric disease. IVP or MRI may be warranted if a recurrence is suspected. A high index of suspicion should be maintained on the part of the clinician to avoid the devastating consequences of silent kidney loss. Patients should be counseled about the risk of disease recurrence, especially in those not undergoing postoperative hormonal suppression.

In conclusion

While endometriosis of the genitourinary tract is rare, patients can experience significant morbidity. Medical management of the disease is often limited by substantial adverse effects that limit treatment duration and is best used postoperatively after excision. An adequate physical exam and preoperative diagnostic imaging can be employed to characterize the extent of disease. When extensive disease involving the ureter is suspected, preoperative consultation with a urologist is encouraged to plan a multidisciplinary approach to surgical resection.

The ideal approach to surgery is laparoscopic resection with or without robotic assistance. Treatment of ureteral disease most commonly involves ureterolysis for cases of extrinsic disease but may require total resection of the ureter with concurrent ureteral reconstruction when disease is intrinsic to the ureter. Surgery for bladder endometriosis depends on the depth of invasion and location of the lesion. Superficial bladder lesions can be treated with fulguration or excision, while deeper lesions involving the detrusor muscle require excision. Lesions in close proximity to the interureteric ridge may require ureteroneocystostomy. Follow-up after excisional procedures involves monitoring the patient for signs and symptoms of disease recurrence, especially in cases of ureteral involvement, to avoid the devastating consequences of silent kidney loss.


Lack of symptoms makes early diagnosis of ureteral endometriosis difficult; histologic evaluation of a biopsy sample is diagnostic


Compared with other approaches, laparoscopic resection of bladder endometriomas is associated with better results in terms of symptom relief, disease progression, and recurrence risk, in our experience


Regular history and physical exam, renal function testing, and pelvic ultrasonography have a role in surveillance for recurrent uretic disease

Megan Kennedy Burns, MD, MA; Michelle A. Wood, DO; Camran Nezhat, MD; and Farr Nezhat, MD

Dr. Burns is Fellow, Camran Nezhat Institute, Palo Alto, California.

Dr. Wood is Fellow, Camran Nezhat Institute.

Dr C. Nezhat is Director of the Camran Nezhat Institute and Founder of Worldwide Endometriosis March.

Dr. F. Nezhat is Director, Nezhat Surgery for Gynecology/ Oncology, PLLC, New York, New York; Clinical Professor, Weill Cornell Medical College of Cornell University, New York, New York; Clinical Professor, Stony Brook University School of Medicine, Stony Brook, New York; and Clinical Professor, NYU Winthrop Hospital, Mineola, New York.

The authors report no financial relationships relevant to this article.


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Caption: FIGURE 1 Ureteral involvement

Caption: FIGURE 2 Innervation of the pelvic organs

Caption: FIGURE 3 Hydroureter caused by extrinsic compression of the ureter from endometriosis

Caption: FIGURE 4 Severe endometriosis of the bladder serosa causing adhesions to the anterior uterus
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Title Annotation:SURGICAL technique
Author:Burns, Megan Kennedy; Wood, Michelle A.; Nezhat, Camran; Nezhat, Farr
Publication:OBG Management
Geographic Code:1U2NY
Date:Mar 1, 2019
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