Ultrasonography of normal and abnormal appendix in children
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Updated: Jun 2, 2026

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Published on: June 21, 2024
Noh Hyuck Park1, Hwa Eun Oh, Hee Jin Park
1Noh Hyuck Park, Hee Jin Park, Ji Yeon Park, Department of Radiology, Kwandong University College of Medicine, Myongji Hospital, 697-24 Hwajung-dong, Deokyang-gu, Goyang-si, Gyeonggi-do 412-270, South Korea.
Insights
Ultrasonography aids in diagnosing appendicitis in children. This study reviews ultrasound findings to improve accuracy and reduce unnecessary surgeries for pediatric appendicitis.
Area of Science:
- Pediatric Surgery
- Diagnostic Imaging
- Gastroenterology
Background:
- Appendicitis is a common pediatric surgical emergency.
- Ultrasonography is a key diagnostic tool for appendicitis since 1986.
- Maximal outer diameter (MOD) is a primary criterion but has limitations.
Purpose of the Study:
- To present a comprehensive spectrum of ultrasonographic findings in normal and abnormal pediatric appendices.
- To enhance diagnostic accuracy for appendicitis in children.
- To minimize unnecessary surgical interventions.
Main Methods:
- Review of ultrasonographic images and findings in pediatric appendicitis cases.
- Analysis of diagnostic criteria, focusing on maximal outer diameter (MOD).
- Discussion of factors causing inaccuracies in MOD measurements.
Main Results:
- Ultrasonography provides a range of findings for normal and abnormal appendices.
- Inaccuracies in MOD measurement can arise from fecal material or inflammatory conditions.
- Accurate interpretation of ultrasound findings is crucial for correct diagnosis.
Conclusions:
- A thorough understanding of ultrasonographic findings is essential for diagnosing pediatric appendicitis.
- Improved diagnostic accuracy through ultrasound can lead to a reduction in unnecessary surgeries.
- This review aims to standardize the interpretation of ultrasound for pediatric appendicitis.
Abstract:
Appendicitis is the most common acute surgical emergency of childhood. Since the original report by Puylaert in 1986, the use of ultrasonography in the diagnosis of appendicitis has been the subject of considerable study. Among the reported diagnostic criteria, the maximal outer diameter (MOD) of the appendix is accepted as the one of the most reliable criteria used to differentiate between a normal appendix and acute appendicitis. However, MOD measurement is subject to inaccuracies because luminal distention by non-compressible, non-inflammatory material such as fecal material, or increased maximal mural thickness due to reactive mucosal lymphoid hyperplasia, or a medical cause due to a generalized gastrointestinal disease, such as Crohn's disease, can cause the measurement to exceed the upper limits of normality. The aim of this article is to introduce the spectrum of ultrasonographic findings in the normal and abnormal appendix and eventually to reduce unnecessary surgery in children.
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