My Clinical Approach
Ureteral diverticulum is a rare entity that requires a high index of suspicion. My goal is precise diagnosis, exclusion of malignancy, and individualized reconstruction with preservation of renal function.
In line with EAU Guidelines 2024 and international literature (J Urol, BJU Int):
- Complete imaging workup: CT urography + retrograde pyelography.
- Ureteroscopy with biopsy to exclude urothelial carcinoma.
- Conservative observation of small asymptomatic diverticula.
- Laparoscopic/robotic diverticulectomy + anastomosis as first-line for symptomatic cases.
- Preservation of maximum ureteral length and tension-free anastomosis (Boari flap if needed).
- Evaluation for coexisting stones or stricture.
What is a ureteral diverticulum
A ureteral diverticulum is a sac-like outpouching of the ureteral wall communicating with the lumen via a narrow or wide neck. When it contains all layers (mucosa, muscle, serosa), it is termed true (congenital); when only the mucosa herniates through a weak muscular point, it is termed pseudo-diverticulum (acquired).
Congenital forms arise from incomplete development of the ureteric bud (abortive bifid ureter). Acquired forms are secondary to ureteral stricture, chronic stones, instrumentation, or inflammation.
Important: Due to chronic urinary stasis, diverticula predispose to stone formation, recurrent infections, and — rarely — to urothelial carcinoma. Histologic confirmation is always required at the time of excision.
Culp classification & morphology
Abortive bifid ureter (blind-ending)
Incomplete bifid ureteral system — one branch ends in a blind sac. Usually in the proximal or mid ureter. Congenital etiology.
Multiple small saccular diverticula
Multiple small mucosal outpouchings, typically acquired after chronic vesicoureteral reflux, inflammation, or chemo-/radiotherapy.
Solitary true diverticulum
Rare, solitary, containing all wall layers. Usually in the mid or distal third. May reach several centimeters.
Pseudo-diverticulum (post-stricture)
Secondary to ureteral stricture or stone obstruction — only mucosa herniates through a weak muscular point.
Symptoms & clinical presentation
Pain
Chronic or intermittent flank pain, colicky when stones form within the diverticulum or when ureteral obstruction occurs.
Infections
Recurrent urinary tract infections from urinary stasis. May progress to pyelonephritis or perinephric abscess.
Hematuria
Gross or microscopic — from mucosal irritation, stones, or rarely urothelial carcinoma within the diverticulum.
Asymptomatic
Many are incidental findings on CT for other indications. Small diverticula without stones/obstruction are observed.
Red flags: urosepsis, hematuria with mass on CT, rapidly progressive pain, hydronephrosis — urgent urological evaluation.
Diagnosis (CTU, RPG, URS)
CT urography (CTU)
Gold standard. Shows the cystic outpouching from the ureteral wall, communication with the lumen, stones within the diverticulum, hydronephrosis. Allows 3D reconstruction.
Retrograde pyelography (RPG)
Confirmatory — provides detailed radiographic depiction of the neck, size, and communication. Useful for surgical planning.
Ureteroscopy (URS)
Direct visualization of the diverticular orifice. Allows biopsy to exclude urothelial neoplasia — mandatory in hematuria or suspicious imaging.
MR urography
In children, pregnancy, renal failure, or iodinated contrast allergy. Provides anatomical detail without radiation.
Renal scintigraphy
MAG3 or DTPA diuretic renography — assessment of functional impact (obstruction, split renal function).
Urine culture + cytology
Always before surgery: exclusion of active infection, evaluation of cytology (high-grade urothelial cells).
Diagnostic pitfalls: Diverticulum may be confused with ureterocele, periureteral abscess, ovarian cyst, or ureteral cancer with central necrosis. RPG and URS with biopsy are critical for differential diagnosis.
Treatment options
1. Conservative observation
For small asymptomatic diverticula without stones, infections, or obstruction. Annual US/CT and urine culture.
2. Laparoscopic/robotic diverticulectomy + ureteroureterostomy
First-line for diverticula in the proximal and mid ureter. Complete excision + end-to-end anastomosis with JJ stent. Excellent results >95%.
3. Ureteral reimplantation
For distal third diverticula: excision + reimplantation by Cohen or Politano-Leadbetter, with antireflux mechanism. Boari flap or psoas hitch if length is needed.
4. Endoscopic management
For selected small diverticula with a wide neck: ureteroscopy + holmium laser ablation or electrofulguration of the mucosa. Less invasive — higher recurrence rate.
5. Nephroureterectomy
In confirmed urothelial carcinoma within the diverticulum or in a non-functioning kidney from chronic obstruction.
Follow-up & prognosis
- JJ stent removal at 4-6 weeks postoperatively.
- Renal US + creatinine at 3, 6, 12 months, then annually.
- CT urography at 1 year — check anastomotic patency.
- Cystoscopy + cytology annually × 5 years if confirmed or suspicious urothelial pathology.
- Immediate evaluation for new hematuria, pain, or infection.
In summary: A rare anatomical anomaly with excellent prognosis after complete excision and reconstruction. Proper preoperative workup and exclusion of malignancy are critical.
Frequently Asked Questions (FAQ)
What is a ureteral diverticulum?
A ureteral diverticulum is a rare anatomical anomaly — a sac-like outpouching of the ureteral wall. It is classified as congenital (true), containing all layers of the ureteral wall, or acquired (false / pseudo-diverticulum), with only mucosal herniation through a weak muscular point following stricture, stones, or chronic inflammation.
How is it classified?
The Culp classification (1947): (1) abortive bifid ureter (blind-ending) — usually proximal; (2) multiple small saccular diverticula — often acquired after inflammation; (3) solitary true diverticulum — rare, in the mid or distal ureter.
How common is it?
Very rare: fewer than 100 cases in the literature. Autopsy incidence ~0.01-0.5%. More common in men (2:1). Can present at any age — congenital usually in children, acquired in adults >50 years.
What are the symptoms?
Often asymptomatic (incidental finding). When symptomatic: flank pain, recurrent urinary tract infections, hematuria, stone formation within the diverticulum (urinary stasis), palpable mass on imaging, rarely obstruction with hydronephrosis from mass effect.
How is it diagnosed?
CT urography (CTU): gold standard — shows the cystic outpouching with a narrow neck communicating with the ureter. Retrograde pyelography (RPG): confirms the communication and dimensions. Ureteroscopy (URS): direct visualization, biopsy if malignancy is suspected. MR urography: in children to avoid radiation exposure.
When is surgery needed?
For symptomatic diverticula: recurrent infections, stones, significant pain, hematuria, obstruction, or suspicion of malignancy. Small asymptomatic diverticula are followed with annual ultrasound/CT.
What are the surgical options?
Diverticulectomy + ureteral reconstruction is the principle of treatment. For mid/proximal ureter — resection and end-to-end ureteroureterostomy. For distal ureter — ureteral reimplantation (Cohen or Politano-Leadbetter) with psoas hitch / Boari flap if length is needed. Laparoscopic or robotic approach. In selected small diverticula: endoscopic management with holmium laser.
What is the prognosis?
Excellent after complete excision and reconstruction: >95% success. Renal function is preserved when there is no chronic obstruction. Possible complications: anastomotic stricture (<5%), urinary tract infection, rarely malignant transformation (urothelial carcinoma) in chronically irritated diverticula.
Related Topics
Suspected ureteral diverticulum?
Contact us for complete urological assessment: CT urography, retrograde pyelography, ureteroscopy and an individualized reconstructive plan.
Scientific References
- EAU Guidelines — uroweb.org
- Culp OS. Ureteral diverticulum: classification of the literature and report of an authentic case. J Urol 1947;58(5):309-21 — pubmed.ncbi.nlm.nih.gov
- Sarajlic M, Drabbe R. Ureteral diverticula: a review and contemporary management. BJU Int 2018;121(6):837-43 — pubmed.ncbi.nlm.nih.gov
- Wegner HE, Pichlmeier U, Loy V, Dieckmann KP. Ureteric diverticula. Br J Urol 1995;75(4):524-7 — pubmed.ncbi.nlm.nih.gov
- Macejko AM, Stein E, Zampini A, et al. Robotic-assisted laparoscopic ureteral diverticulectomy. J Endourol 2008;22(11):2469-72 — pubmed.ncbi.nlm.nih.gov
Meet the Doctor
Dr. Marinos Vasilas, Urologist – Andrologist
Dr. Marinos Vasilas manages ureteral diverticula with a modern laparoscopic and robotic approach: diverticulectomy, end-to-end anastomosis, and ureteral reimplantation per EAU Guidelines.
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