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Related Concept Videos

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
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Related Experiment Video

Updated: Jun 15, 2026

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
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New method for internal anal sphincter measurements: feasibility study.

A Sboarina1, A Minicozzi, C Cordiano

  • 1First Clinical Division of General Surgery, Anaesthesiological and Surgical Science Department, University Hospital of Verona, Verona, Italy. andrea.sboarina@univr.it

International Journal of Computer Assisted Radiology and Surgery
|February 25, 2010
PubMed
Summary

This study introduces a new 3D endosonography software for precise internal anal sphincter (IAS) measurements. The method demonstrates good accuracy and reproducibility, aiding detailed IAS morphology studies.

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Area of Science:

  • Medical imaging analysis
  • Gastroenterology
  • Anorectal physiology

Background:

  • Accurate measurement of the internal anal sphincter (IAS) is crucial for understanding anorectal function and dysfunction.
  • Existing methods may lack the precision required for detailed morphological analysis.

Purpose of the Study:

  • To present a novel method for quantitative analysis of the internal anal sphincter using three-dimensional (3D) endosonographic images.
  • To develop software capable of calculating multiple measurements (thickness, length, area, volume) to describe the 3D shape of the IAS muscle.

Main Methods:

  • A software tool was developed to perform quantitative analysis of 3D endosonographic images, calculating thickness, length, area, and volume of the IAS.
  • Measurements were standardized using a common reference system and modeled spatially.
  • The method's precision and reproducibility were validated using phantom models and subsequently tested on fifteen healthy patients by two independent operators.

Main Results:

  • Phantom measurements showed high accuracy with minimal errors (e.g., thickness: 0.05 +/- 0.1 mm).
  • Inter-observer variability was assessed, with most measurements showing good agreement.
  • In vivo measurements for healthy patients yielded mean thickness of 1.71 +/- 0.34 mm, length of 33.24 +/- 6.10 mm, and area of 111.28 +/- 29.08 mm².

Conclusions:

  • The developed 3D endosonography method offers satisfactory accuracy and precision for IAS measurements.
  • The analysis confirms good inter-observer agreement for most IAS segments, with minor variability noted in specific regions.
  • This quantitative approach enables detailed studies of IAS morphology.