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Endoluminal transrectal ultrasonography: accuracy, reliability, and validity

M J Solomon1, R S McLeod

  • 1Department of Surgery, University of Toronto, Ontario, Canada.

Diseases of the Colon and Rectum
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Endoluminal rectal ultrasonography (EU) accurately assesses rectal cancer wall penetration but shows moderate accuracy for lymph node involvement. Its clinical decision-making validity will determine widespread adoption for rectal cancer staging.

Area of Science:

  • Gastroenterology
  • Surgical Oncology
  • Diagnostic Imaging

Background:

  • Preoperative assessment of rectal cancer is crucial due to high local recurrence rates.
  • Current clinical assessments for rectal cancer staging have limitations in accuracy.
  • Endoluminal rectal ultrasonography (EU) offers direct visualization of tumor invasion and lymph nodes.

Purpose of the Study:

  • To review the literature on the accuracy, reliability, and validity of endoluminal rectal ultrasonography (EU) for rectal cancer staging.
  • To assess the effectiveness of EU in determining tumor penetration and lymph node involvement.
  • To evaluate the potential for widespread implementation of EU in clinical practice.

Main Methods:

  • A literature review was conducted, synthesizing data from cross-sectional studies.

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  • Data on tumor penetration and lymph node involvement were collected from 873 and 571 patients, respectively.
  • Statistical accuracy was assessed using kappa values.

    • Main Results:

    • EU demonstrated high accuracy (kappa = 0.85) in assessing rectal tumor wall penetration.
    • EU showed moderate accuracy (kappa = 0.58) in detecting pararectal lymph node involvement.
    • Reliability and validity assessments were limited, with a proposed protocol for reliability.

    Conclusions:

    • Endoluminal rectal ultrasonography (EU) is a credible and feasible tool for evaluating rectal cancer, particularly for tumor penetration.
    • Its moderate accuracy in lymph node staging requires further investigation.
    • The clinical utility and content validity of EU will determine its broader application in rectal cancer management.