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Related Experiment Video

Updated: Aug 15, 2025

Exploring the Use of Isolated Expressions and Film Clips to Evaluate Emotion Recognition by People with Traumatic Brain Injury

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[One clip too many].

Marlene Felsner^1,2, Bernhard Grubmüller³

¹Klinische Abteilung für Urologie, Universitätsklinikum Krems, Mitterweg 10, 3500, Krems, Österreich. marlene.felsner@krems.lknoe.at.

Urologie (Heidelberg, Germany)

|January 6, 2023

Summary

A Mainz II pouch complication led to kidney blockage after a colonoscopy mistakenly removed ureteral openings. A successful rendezvous procedure restored urine flow, creating a permanent stoma.

Keywords:

Bladder cancer Colonoscopy Hydronephrosis Mainz II pouch Urology

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Area of Science:

Urology
Gastroenterology
Oncology

Background:

A patient with a Mainz II ileal pouch-anal anastomosis for muscle invasive bladder cancer developed left-sided hydronephrosis.
The complication arose subsequent to a routine colonoscopy.

Observation:

Diagnostic workup revealed that the left ureteral neo-ostium had been inadvertently removed and clipped during colonoscopy, mistaking it for a polyp.
This led to complete obstruction of urine outflow from the left kidney.

Findings:

A challenging case requiring a multidisciplinary approach involving urology and gastroenterology.
Urine outflow was successfully restored using a rendezvous technique, combining antegrade ureteroscopy and colonoscopy.
A biliary stent was placed into the left neo-ostium to facilitate urine drainage after initial nephrostomy placement.

Implications:

This case highlights a rare but serious complication of colonoscopy in patients with urinary diversions.
The successful use of the rendezvous technique and biliary stent demonstrates an effective management strategy for iatrogenic ureteral obstruction.
It underscores the importance of meticulous examination during colonoscopy in patients with prior pelvic surgery and urinary diversion.