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[Ultrasonography of the normal vermiform appendix]

T Rettenbacher1, A Hollerweger, P Macheiner

  • 1Abteilung für Röntgendiagnostik und Nuklearmedizin Krankenhaus der Barmherzigen Brüder in Salzburg.

Ultraschall in Der Medizin (Stuttgart, Germany : 1980)
|June 1, 1997
PubMed
Summary

Ultrasound can detect the vermiform appendix in 63% of asymptomatic adults, though visualization varies. The normal appendix

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Area of Science:

  • Medical imaging
  • Gastroenterology
  • Anatomy

Background:

  • The vermiform appendix is a key anatomical structure.
  • Ultrasound is a common diagnostic imaging modality.

Purpose of the Study:

  • To determine the detectability of the vermiform appendix using ultrasound in asymptomatic adults.
  • To describe the typical sonographic appearance and size of a normal appendix.

Main Methods:

  • Prospective study of 300 asymptomatic adult patients.
  • Utilized 3.5 MHz annular array and 5 MHz linear array ultrasound transducers.
  • Assessed appendix visualization, characteristics, and measurements.

Main Results:

  • The appendix was visualized in 63% of patients.
  • Common reasons for non-visualization included obesity and atypical cecal position.
  • The sonographic appearance was an aperistaltic, blind-ending structure originating from the cecum.
  • Mean transverse diameter was 5.2 mm, with 76% measuring less than 6 mm.
  • Intraluminal gas was present in 86% of visualized appendices.

Conclusions:

  • Sonographic visualization of the normal appendix is achievable but variable.
  • The appearance and dimensions of the normal appendix demonstrate significant diversity.
  • Factors like patient obesity and appendix location influence detectability.

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