Female urethral diverticulum: a pathological insight

A diagnostic conundrum: Is it a periurethral diverticulum/cyst or a bulking agent (Bulkamid)?

INTRODUCTION

Urethral bulking agents are commonly used to manage female stress urinary incontinence (SUI) as they have been suggested to be safe, efficacious, and a minimally invasive surgical option. Bulkamid is a newer bulking agent that has been introduced and promoted in the market for use. It is non-particulate in nature with high tissue biocompatibility, and consequently, it is difficult to differentiate between Bulkamid and a periurethral cyst on magnetic resonance imaging (MRI). This, therefore, presents a diagnostic dilemma.

METHODS AND MATERIALS

Here we describe two cases with previous injections of Bulkamid referred to our Centre for management of a presumed periurethral diverticulum based on MRI findings. Both patients were reviewed and examined in outpatient clinics with MRI findings discussed at MDT, further imaging was required.

RESULTS

We found that a limited noncontrast computed tomography (CT) pelvis, followed by a voiding cystometrogram (VCMG), and then a repeat limited noncontrast CT pelvis effectively differentiated between Bulkamid and these presumed periurethral diverticulae. The theory behind this was that during micturition, the contrast would pass through to the urethral diverticulum and appear as high-density (bright) material within the periurethral region (the pre-VCMG was required to prove that any high-density material was due to the contrast and not pre-existing high-contrast material).

CONCLUSION

A CT scan done in conjunction with a VCMG is likely to be more effective in differentiating between Bulkamid and a true periurethral diverticulum than an MRI scan. Appropriate diagnostic evaluation of periurethral lesions can lead to time-saving and cost-effective patient management as this will bypass the need for unnecessary investigations and possible unwarranted surgical intervention.

A prospective cohort trial evaluating sexual function after urethral diverticulectomy

OBJECTIVE

Dyspareunia is a main symptom of urethral diverticulum in the female population, reported up to 60% of patients. Pain may cease after diverticulectomy as published in previous retrospective studies. To date scarce or no data exists on the postoperative outcome in terms of sexual function. The present study wants to quantify sexual function and evaluate lower urinary tract symptoms in sexually active patients after resection of urethral diverticulum.

STUDY DESIGN

In this prospective cohort trial at a tertiary referral center, we evaluated 40 female patients who presented with symptomatic urethral diverticulum and were sexually active. All of them underwent a standardized surgical procedure with inverted U-shape colpotomy between 2008 and 2018. The patients completed the Female Sexual Function Index (FSFI), which is determined by the mean score of the different domains, and underwent urodynamic assessment both at baseline examination before surgery and 12 months postoperatively. For statistical analysis, we conducted a paired Wilcoxon rank sum test analyzing the non-normally distributed non-parametric variables of the female sexual function index.

RESULTS

In two patients a malignancy was found in postoperative histology and received a different therapeutical approach. They have been excluded from statistical analysis. Sexual function improved in all domains (n = 38): total score (Z = -5.4, P < 0.000), satisfaction (Z = -5.3, P < 0.000), pain (Z = -5.4, P < 0.000), arousal (Z = -2.6, P = 0.010), lubrication (Z = -2.4, P = 0.020), desire (Z = -2.6, P = 0.009) and orgasm (Z = -2.2, P = 0.029). Maximum urethral closure pressure deteriorated from 39 to 36 cmH2O (P = 0.0008) and residual urine increased from 10 ml to 20 ml after surgery (P = 0.0019). No statistical significance is found for bladder capacity and free urinary flow.

CONCLUSIONS

All domains of the female sexual function index improved. Patients' bothersome symptoms, mainly pain may cease and sexual satisfaction increases, which is reassuring concerning patients' preoperative consent. We should be aware that occasionally an unexpected malignancy may be detected and it is mandatory to examine all excised tissue histologically. Lower urinary tract function remains clinically unchanged, although maximum urethral closure pressure deteriorated and postvoid residual increased though not being clinically significant.

Pathophysiology and Management of Long-term Complications After Transvaginal Urethral Diverticulectomy

Female urethral diverticulum (UD) is a rare and benign condition that presents as an epithelium-lined outpouching of the urethra. It has various symptoms, of which incontinence in the form of postmicturition dribble is the most common. The gold standard for the diagnosis of UD is magnetic resonance imaging, and the treatment of choice is transvaginal diverticulectomy. Despite the high success rate of transvaginal diverticulectomy, postoperative complications such as de novo stress urinary incontinence (SUI), recurrence, urethrovaginal fistula, recurrent urinary tract infections, newly-onset urgency, and urethral stricture can occur. De novo SUI is thought to result from weakening of the anatomical support of the urethra and bladder neck or damage to the urethral sphincter mechanism during diverticulectomy. It can be managed conservatively or may require surgical treatment such as a pubovaginal sling, Burch colposuspension, or urethral bulking agent injection. Concomitant SUI can be managed by concurrent or staged anti-incontinence surgery. Recurrent UD may be a newly formed diverticulum or the result of a remnant diverticulum from the previous diverticulectomy. In cases of recurrent UD requiring surgical repair, placing a rectus fascia pubovaginal sling may be an effective method to improve the surgical outcome. Urethrovaginal fistula is a rare, but devastating complication after urethral diverticulectomy; applying a Martius flap during fistula repair may improve the likelihood of a successful result. Malignancies in UD are rarely reported, and anterior pelvic exenteration is the recommended management in such cases.

Urethral Masses

Urethral and periurethral masses in women include both benign and malignant entities that can be difficult to clinically differentiate. Primary urethral carcinoma is rare and the optimal treatment modality may vary depending on the stage at presentation. Because cancer-free survival is poor, clinicians shouldhave a high index of suspicion when evaluating a urethral mass. Some benign-appearing urethral masses may be safely observed. Surgical resection is an effective option that should be used based on patient preference and symptoms, and for suspicious lesions.

Urethral Diverticulum following Polypropylene Mesh Midurethral Slings: A Literature Review

Aims

It is currently unknown whether an association exists between polypropylene mesh and urethral diverticulum formation following placement of polypropylene midurethral slings (MUS) for the treatment of stress urinary incontinence (SUI). We aimed to examine the literature associating MUS with the occurrence of urethral diverticula.

Methods

Multiple online research databases, including PubMed, Google Scholar, EBSCOhost, and the Cochrane Library, were searched, from January 2019 to February 2019, for evidence related to the occurrence of urethral diverticula following polypropylene MUS procedures.

Results

Four case reports were published demonstrating the occurrence of urethral diverticula following the use of polypropylene mesh for surgical treatment of SUI. Subjects of these cases were menopausal and had an elevated body mass index (BMI), recurrent urinary tract infections (UTIs), autoimmune conditions, or prior pelvic floor surgeries. A thorough urologic workup, including imaging prior to sling placement, was not always performed.

Conclusion

No clear association exists between polypropylene MUS placement and subsequent urethral diverticulum formation. Factors that diminish polypropylene mesh biocompatibility include elevated BMI, menopause, recurrent UTIs, prior pelvic surgeries, and preexisting medical conditions. Symptoms associated with urethral diverticula should prompt a complete urologic workup prior to MUS placement.

Can magnetic resonance imaging differentiate among transurethral bulking agent, urethral diverticulum, and periurethral cyst?

PURPOSE

To evaluate magnetic resonance imaging findings that differentiate among periurethral bulking agents (primarily collagen), urethral diverticulum, and periurethral cyst.

METHODS

We searched our radiologic database retrospectively from 2001 to 2017 for periurethral cystic lesions, identifying a total of 50 patients with 68 lesions. Final diagnoses in 68 lesions were bulking agents (27), urethral diverticula (29), and periurethral cysts (12). Two abdominal radiologists, blinded to clinical history, independently evaluated T1, T2, and post-contrast images. The readers assessed number, morphological features, location, connection to urethra and mass effect, signal intensity, and enhancement for each lesion. Fisher exact test and logistic regression analysis were performed for each univariate significant feature. The operative and pathologic reports were the reference standard.

RESULTS

Magnetic resonance imaging features found more often in bulking agents versus urethral diverticulum were multiple lesions (P = 0.011), upper or upper-mid-urethral location (P ≤ 0.0001), lack of internal fluid/fluid level (P = 0.002), no urethral connection (P = 0.005), T1 isointensity, and T2 mild hyperintensity compared to muscles but lower T2 signal than urine (P < 0.0001). Most cases of urethral diverticula and periurethral cysts were detected at mid- and lower urethra. Urethral diverticula were larger than bulking agents and periurethral cysts (P = 0.005 and P = 0.023) (mean diameter = 24, 16, 15 mm, respectively). Most bulking agents (93%) and urethral diverticula (90%) showed mass effect on urethra, while periurethral cysts (75%) did not (P < 0.0001).

CONCLUSION

Signal intensity and lesion characterization on magnetic resonance imaging can significantly differentiate bulking agent from urethral diverticulum and periurethral cyst. Radiologists should consider differential diagnosis of a bulking agent, especially when distinguishing characteristics described here are present to prevent incorrect diagnosis and ultimately unnecessary surgical intervention.

Urethral diverticulum carcinoma in females-a case series and review of the English and Japanese literature

The aims of our study were to describe our case series of three urethral diverticulum carcinomas (UDC) in women and to review the literature on UDC in females to determine patient characteristics, presenting symptoms and outcomes along with optimal investigations and treatment modalities. A literature search was performed utilizing Medline, EMBASE and the Cochrane library for all papers including case reports on UDC in women published to date. The results along with those of our three cases are detailed. A total of 126 cases of UDC in women have been reported; 75% adenocarcinoma (Adenoca), 15% transitional cell carcinoma (TCC) and 10% squamous cell carcinoma (SCC). Median age at presentation was 53 years (range, 14-81 years). The commonest presenting symptoms were bleeding and retention. Cystoscopy, MRI and trans-urethral biopsy were the commonest methods of diagnosis. Treatment was radiotherapy +/- chemotherapy alone in 21%, local excision +/- radiotherapy in 44%, urethrectomy in 3% and anterior exenteration +/- radiotherapy in 32%. At last follow-up 63% were alive and well, 10% were alive with recurrent cancer and 25% had died from their disease. UDC is rare in women. It is predominantly adenocarcinoma. There is no established treatment and survival is at best moderate. An international registry and consensus on management is needed if this is to be improved.

A complicated urethrovaginal fistula following an inappropriate urethral diverticulum management

OBJECTIVE

Urethral diverticulum is uncommon, therefore appropriate evaluation, preoperative planning and counseling must be done in order to make correct diagnosis and prevent complications.

MATERIALS AND METHODS

A case of anterior vaginal wall mass was treated elsewhere by a gynecologist as periurethral cyst abscess; incision and drainage were done but a symptom of pus discharge was observed after 2 weeks. Therefore, exploration, cyst wall excision and primary closure were done though histopathological examination surprisingly confirmed the presence of urethral tissue suggestive of diverticulum.

RESULTS

Subsequently, she developed persistent urinary leakage along with urethrovaginal fistula for which they again performed pervaginal multilayer closure. Patient was later referred to us with recurrent urethrovaginal fistula. We performed posterior urethral fistulectomy with anterior vaginal wall flap and multilayer closure. Three years follow up reveals complete recovery.

CONCLUSION

Even urethral diverticulum is a rare condition, should be kept in mind as early diagnosis and management.

Urethral diverticula in women

Female urethral diverticula are rare, benign epithelium-lined outpouchings of the female urethra. Patients can present with a multitude of symptoms, most commonly urinary incontinence, recurrent UTIs and dyspareunia. These presenting symptoms are often confused with other diagnoses leading to delayed diagnosis or misdiagnosis. Diagnosis and preoperative assessment of bladder function is most accurate using a combination of clinical examination, T2-weighted postvoid MRI and videocystometrography. Best treatment is by vaginal excision, a procedure with a very low recurrence rate and high patient acceptability. Excision also results in high cure rates for associated dyspareunia, UTI and voiding dysfunction. Pre-existing urodynamically proven stress urinary incontinence (USUI) resolves in 50% of patients after excision of the diverticulum with Martius labial fat pad interposition without the need for further treatment. Potential adverse effects after surgery are new-onset USUI, urethrovaginal fistula and urethral stricture. The rate of onset of these potential adverse effects is low and related to the preoperative appearance of the diverticulum on an MRI scan and the complexity of the diverticulum.

Pathologic Outcomes following Urethral Diverticulectomy in Women

Purpose. Although most urethral diverticula in women are benign, there is a subset of patients who develop malignant changes. Limited studies report the pathologic findings associated with this relatively rare entity. We describe the clinicopathologic findings of women who underwent urethral diverticulectomy. Methods. A consecutive series of 29 women who underwent surgical resection of a urethral diverticulum were identified between 1992 and 2013. Clinical and radiographic data was collected by retrospective review of patient medical records. All pathological slides were rereviewed by a single urologic pathologist. Results. Of the 14 women with clinical data, 9 (64%) presented with urgency, 7 (50%) with urinary frequency, 3 (21%) with urinary incontinence, and 3 (21%) with dysuria. Mean diverticular size was 2.3 (±1.4) cm. Although one patient (3%) had invasive adenocarcinoma on final pathology, the remaining 28 cases (97%) demonstrated benign features. The most common findings were inflammation (55%) and nephrogenic adenoma (21%). Conclusions. Although most urethral diverticula in women are benign, there is a subset of patients who develop malignancy in association with the diverticulum. In this series, 97% of cases had a benign histology. These findings are important when counseling patients regarding treatment options.

Diagnosis of female urethral diverticulum using transvaginal contrast-enhanced sonourethrography

INTRODUCTION AND HYPOTHESIS

This study investigated the value of transvaginal contrast-enhanced sonourethrography for the diagnosis of female urethral diverticulum (UD) by comparing results of contrast-enhanced ultrasound images and surgical findings.

METHODS

A total of 14 female UD patients underwent preoperative transvaginal contrast-enhanced sonourethrography between July 2010 and June 2012. History and physical examination were initially assessed by the same urologist. Transvaginal contrast-enhanced ultrasound imaging was performed and interpreted by the same ultrasonographer. Definite diagnosis was made by tracking the flow of the microbubbles into the cyst. Additionally, sagittal, cross-sectional, and dynamic images were obtained, and color Doppler ultrasound was applied in all cases. Data on the size, location, configuration, and opening of the UD was documented, and then compared with the surgical findings.

RESULTS

The most common symptoms presenting in the UD patients included urinary incontinence (71.5 %), recurrent urinary tract infection (57.1 %), frequency (50 %), urgency (35.7 %), dysuria (35.7 %), and dyspareunia (21.4 %). On physical examination, 8 out of 14 patients (57.1 %) had a palpable anterior vaginal wall mass, while 6 out of 14 patients (42.9 %) had no palpable mass. Transvaginal contrast-enhanced sonourethrography revealed 17 diverticula orifices in total and correlated well with surgical findings regarding the size, location, configuration, and the opening of the UD.

CONCLUSIONS

In patients with chronic irritative bladder symptoms, but with no response to conventional treatment a high index of suspicion for UD should be maintained. Our study demonstrates that transvaginal contrast-enhanced sonourethrography is a useful tool for defining the size, location, configuration, and opening of the UD before surgery.

Diagnosis and management of female urethral diverticulum

Female urethral diverticulum is a disorder that affects 1% to 6% of women. Women with diverticula may present with a variety of nonspecific genitourinary complaints, making the diagnosis challenging. Diagnosis is made by physical examination and can be confirmed with cystourethroscopy and/or radiographic imaging. Asymptomatic women can be managed conservatively, whereas treatment for symptomatic women usually involves a diverticulectomy. Potential complications from diverticulectomy include diverticulum recurrence, de novo stress incontinence, urethrovaginal fistula, urethral stricture, and recurrent urinary tract infections. This article reviews the etiology, differential diagnoses, evaluation, and management of female urethral diverticula.

Utility of clinical parameters, cystourethroscopy, and magnetic resonance imaging in the preoperative diagnosis of urethral diverticula

INTRODUCTION AND HYPOTHESIS

Our purpose was to assess the accuracy of history and physical, cystourethroscopy, and magnetic resonance imaging (MRI) in preoperative diagnosis of urethral diverticula.

METHODS

This was a retrospective review of all patients who underwent surgical excision of periurethral masses between 1998 and 2009. Presenting symptoms and examination and cystourethroscopic findings were noted. A single pathologist reviewed all cases and provided the reference standard for the diagnosis of a diverticulum. A single radiologist reviewed all preoperative MRI studies. Sensitivities, specificities, and positive and negative predictive values (PPV, NPV) were determined.

RESULTS

Diverticula were diagnosed in 36/60 (60 %) patients. Transurethral fluid expression on palpation and recurrent urinary tract infection (UTI) had high PPV. Sensitivity, specificity, PPV, and NPV, respectively, for cystourethroscopy were 33 %, 100 %, 100 %, and 42 %; for MRI, these were 100 %, 83 %, 92 %, and 100 %.

CONCLUSION

These data reinforce the utility of transurethral fluid expression for preoperative evaluation of urethral diverticula. Additionally, MRI is an excellent adjunctive diagnostic tool and may assist in establishing the diagnosis when there is high clinical suspicion of a urethral diverticulum but nonconfirmatory findings on cystourethroscopy.

[Treatment approach to female urethral diverticulum]

Female urethral diverticula are uncommon and are more frequent between the third and fifth decades of life. They are usually diagnosed late. Most urethral diverticula are related to recurrent infections of the periurethral glands or urethral trauma. Cystourethrography and magnetic resonance imaging are the most valuable diagnostic methods. The treatment of choice is thte resection of the diverticulum.