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Difficulty: HardPelvic Floor Disorders and Urogynecology

A 38-year-old woman presents to the urogynecology clinic complaining of an 8-month history of continuous postvoid dribbling, dysuria, and pelvic pressure. She also reports deep dyspareunia. Over the past year, she has visited urgent care clinics on three separate occasions for presumed urinary tract infections; each time, she received a short course of oral antibiotics which provided temporary relief of her dysuria. Her past medical history is notable for a spontaneous vaginal delivery 44 years ago complicated by a prolonged second stage of labor. Vital signs are within normal limits. Pelvic examination reveals normal external genitalia. Speculum examination demonstrates a 33 cm, exquisitely tender, fluctuant, cystic mass located on the anterior vaginal wall. Gentle palpation of this mass expresses a small amount of purulent discharge from the urethral meatus. Urinalysis demonstrates 1515-2020 leukocytes per high-power field, positive leukocyte esterase, and negative nitrites. Which of the following is the most appropriate next step in management?

  1. Magnetic resonance imaging of the pelvisAnswer
  2. B
    Incision and drainage of the vaginal mass
  3. C
    Prescription of oral oxybutynin
  4. D
    Empirical therapy with oral ciprofloxacin
  5. E
    Complex urodynamic testing

Answer

Magnetic resonance imaging of the pelvis
The correct answer is magnetic resonance imaging (MRI) of the pelvis. This patient's presentation is highly suggestive of a urethral diverticulum. The classic presentation includes the '3 Ds': dysuria, dyspareunia, and dribbling (postvoid). Physical examination typically reveals a tender, cystic mass on the anterior vaginal wall, and compressing the mass may express purulent or bloody discharge from the urethral meatus. Because a urethral diverticulum is a localized outpouching of the urethral mucosa into the surrounding tissue, it acts as a reservoir that can collect urine and debris, leading to recurrent inflammation and infections. While the clinical picture strongly points toward this diagnosis, advanced imaging is required before any surgical intervention. Pelvic MRI is the modality of choice because of its high sensitivity and excellent soft-tissue contrast, which allows for precise mapping of the diverticulum's size, complexity, and relationship to the urethral sphincter. Transvaginal or transperineal ultrasound is an alternative but is generally less sensitive than MRI.

Step-by-Step Solution

1
Analyze the classic triad of symptoms and physical exam findings.
The patient presents with dyspareunia, dysuria, and postvoid dribbling (the '3 Ds'), alongside a tender anterior vaginal wall mass expressing purulence.
Identifying these pathognomonic features establishes the clinical suspicion for a urethral diverticulum rather than an uncomplicated recurrent urinary tract infection or overactive bladder.
2
Determine the appropriate diagnostic workup.
Advanced imaging is required to confirm the diagnosis and map the diverticulum's size, number, and exact location.
Careful anatomical delineation is essential to plan definitive surgical excision (diverticulectomy) and minimize the risk of severe complications such as urethrovaginal fistulas.
3
Select the best imaging modality.
Magnetic resonance imaging (MRI) of the pelvis is chosen.
MRI is the most sensitive and specific non-invasive test for diagnosing and anatomically characterizing a urethral diverticulum.

Key Concept

Urethral diverticulum frequently presents with dysuria, dyspareunia, and postvoid dribbling, alongside a palpable anterior vaginal mass; diagnosis is confirmed with pelvic MRI.
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Topics

Pelvic Floor Disorders and Urogynecology

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