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Urinary Tract Calculi III: Medical Management01:30

Urinary Tract Calculi III: Medical Management

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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)...
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Urinary Tract Calculi VI: Surgical Management01:25

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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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Imaging Studies V: Intravenous Urography and Retrograde Pyelography01:22

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IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
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Endoscopic Procedures V: ERCP01:26

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Endoscopic Retrograde Cholangiopancreatography (ERCP) is a diagnostic procedure that combines endoscopy and fluoroscopy to diagnose and treat conditions related to the bile ducts, pancreatic ducts, and gallbladder. This procedure is beneficial for identifying and addressing blockages, gallstones, strictures, and tumors within the biliary or pancreatic systems. ERCP is both diagnostic and therapeutic, offering the ability to visualize and treat identified problems in one session.
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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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Ultrasound II: Endoscopic Ultrasound and FibroScan01:25

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Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
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Related Experiment Video

Updated: Sep 21, 2025

Standardization of Basket Use in Sialendoscopy: A Ten-Year Retrospective Study
09:36

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Published on: June 6, 2025

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How Reliable Is Endoscopic Stone Recognition? A Comparison Between Visual Stone Identification and Formal Stone

Michaël M E L Henderickx1, Simone J M Stoots1, Daniel M De Bruin1

  • 1Department of Urology, Amsterdam UMC Location University of Amsterdam, Amsterdam, the Netherlands.

Journal of Endourology
|June 2, 2022
PubMed
Summary
This summary is machine-generated.

Endoscopic stone recognition (ESR) has limited diagnostic accuracy for identifying stone composition. Intra-observer agreement among urologists was also below acceptable levels, suggesting ESR is not a reliable alternative to formal stone analysis.

Keywords:
endoscopic stone recognitionendourologystone compositionureterorenoscopyurinary stone analysis

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Area of Science:

  • Urology
  • Nephrology
  • Medical Imaging

Background:

  • Accurate kidney stone analysis is crucial for preventing recurrence.
  • Formal stone analysis methods like X-ray diffraction (XRD) are accurate but time-consuming and costly.
  • Endoscopic stone recognition (ESR) offers potential for immediate stone composition assessment.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of ESR compared to formal stone analysis.
  • To assess the intra-observer agreement of ESR among endourologists.

Main Methods:

  • Fifteen endourologists viewed 100 ureteroscopy videos to predict stone composition.
  • Diagnostic accuracy was determined by comparing predictions with XRD analysis.
  • Intra-observer agreement was assessed by re-reviewing videos after 30 days.

Main Results:

  • Median diagnostic accuracy varied significantly by stone type, with cystine (up to 80%) and calcium oxalate dihydrate (up to 75%) showing higher accuracy than others.
  • Accuracy for calcium hydroxyphosphate, calcium hydrogen phosphate dihydrate, calcium magnesium phosphate, magnesium ammonium phosphate, and uric acid was generally low (0-40%).
  • Intra-observer agreement ranged from 45% to 72%, indicating moderate consistency.

Conclusions:

  • The diagnostic accuracy of ESR is limited, with substantial variability depending on stone composition.
  • Intra-observer agreement for ESR is below acceptable thresholds, questioning its reliability as a standalone diagnostic tool.
  • ESR cannot currently replace formal stone analysis for guiding stone recurrence prevention strategies.