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Related Concept Videos

Urinary Tract Calculi VI: Surgical Management01:25

Urinary Tract Calculi VI: Surgical Management

366
Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
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Ureters01:22

Ureters

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The ureters are retroperitoneal tubes located on either side of the vertebral column. They are responsible for transporting urine from each kidney to the urinary bladder. These tubes have thick walls and are approximately 25-30 cm long. Their diameter is around 10 mm at the renal pelvis, gradually narrowing to 1 mm as the ureter obliquely enters the posterior bladder wall through the ureteric orifices. The shape of these orifices is slit-like, which helps to prevent urine backflow toward the...
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Urologic Endoscopic Procedure: Cystoscopic Examination01:28

Urologic Endoscopic Procedure: Cystoscopic Examination

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Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...
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Kidney Transplant II: Surgical Procedure01:26

Kidney Transplant II: Surgical Procedure

298
Preoperative ManagementThe primary goals of preoperative management in kidney transplantation are to optimize the patient’s metabolic state and prepare them for surgery through diet adjustments, necessary dialysis, and tailored medical treatment. This phase also involves comprehensive infection screening and patient education about the surgical procedure and postoperative care to improve outcomes and adherence.Medical ManagementA comprehensive evaluation is required for both the living...
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Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

191
The diagnosis of renal calculi involves several imaging techniques, including non-contrast CT scans and ultrasound. These methods help visualize kidney stones, assess their size and location, and detect possible obstructions. Additionally, Measuring urine pH is useful for diagnosing specific stone types, such as struvite (alkaline pH) and uric acid stones (acidic pH). Cystine stones are primarily linked to cystinuria, a genetic condition. A urinalysis helps detect blood in the urine (hematuria)...
191
Urinary Tract Calculi V: Nursing Management01:28

Urinary Tract Calculi V: Nursing Management

262
AssessmentSubjective Data: Obtain a detailed health history, including any recent or chronic urinary tract infections, periods of immobilization, previous episodes of renal calculi, and medical conditions such as gout, benign prostatic hyperplasia, or hyperparathyroidism. Review the medication history for drugs that may influence stone formation, including allopurinol, analgesics, loop diuretics, or thiazide diuretics. Document the use of long-term indwelling catheters and any past surgical...
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Related Experiment Video

Updated: Jan 13, 2026

An Immature Murine Model of Reversible Unilateral Ureteral Obstruction
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An Immature Murine Model of Reversible Unilateral Ureteral Obstruction

Published on: April 4, 2025

774

Stenting severely obstructed ureters: a useful method for a common challenge.

Yoav Avidor1, Ghalib Lidawi1, Muhammad Majdoub1

  • 1Department of Urology, Hillel Yaffe Medical Center, Hadera, 3810000, Israel.

The Canadian Journal of Urology
|January 7, 2026
PubMed
Summary

This study introduces a novel surgical technique for ureteral stent placement using a ureteral dilator as an anchor. This method ensures safe and effective stent insertion even in severe ureteral obstruction cases.

Keywords:
double-J stentseverely-obstructed ureterureteral calculiureteral dilatorureteroscopy

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Area of Science:

  • Urology
  • Surgical Innovation
  • Medical Devices

Background:

  • Retrograde endoscopic stenting is standard for ureteral drainage.
  • Limited innovative surgical techniques exist for severe ureteral obstruction.
  • Technological advancements offer new possibilities for ureteral stenting.

Purpose of the Study:

  • To describe a novel surgical technique for safe ureteral stent placement.
  • To address challenges in stenting severe ureteral obstructions.
  • To present an alternative to percutaneous nephrostomy.

Main Methods:

  • A surgical technique using a ureteral dilator as an anchor for stent insertion.
  • The dilator is positioned against the obstructing stone to dilate the ureter and provide anchorage.
  • Successfully applied in 23 patients with prior failed stent placement attempts.

Main Results:

  • Successful ureteral drainage was achieved in all 23 patients.
  • The technique effectively facilitated precise and secure stent insertion.
  • Percutaneous nephrostomy was avoided in all treated cases.

Conclusions:

  • Ureteral dilator anchorage provides reliable support for stent advancement.
  • This technique offers a safe and effective alternative for ureteral stenting in severe obstruction.
  • The method may reduce the necessity for percutaneous nephrostomy in complex cases.