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Pediatric Radiology

, Volume 36, Issue 11, pp 1171–1176 | Cite as

Optimizing US examination to detect the normal and abnormal appendix in children

  • Adriana B. PelettiEmail author
  • Matteo Baldisserotto
Original Article

Abstract

Background

US detection of a normal appendix can safely rule out appendicitis. However, there is a wide range of accuracy in detection of a normal appendix.

Objective

To optimize US examination to detect the normal and the abnormal appendix according to the potential positions of the appendix.

Materials and methods

This prospective study included 107 children who underwent gray-scale US scanning. Noncompressive and compressive graded sonography was performed to detect normal and abnormal appendices according to their potential positions. The maximum transverse diameter of the appendices was measured.

Results

Of the 107 children examined, 56 had a histologic diagnosis of acute appendicitis. Sonography had a sensitivity of 100% and specificity of 98% for the diagnosis of appendicitis. A normal appendix was visualized in 44 (86.2%) of the 51 patients without acute appendicitis, and of these 44, 43 were true-negative and 1 was false-positive. Normal and abnormal appendices, respectively, were positioned as follows: 54.4% and 39.3% were mid-pelvic; 27.2% and 28.6% were retrocecal; 11.4% and 17.8% were deep pelvic; and 6.8% and 14.3% were abdominal.

Conclusion

US scanning according to the potential positions of the appendix was useful in the detection of normal appendices in children suspected of having appendicitis.

Keywords

Normal appendix Children US 

Notes

Acknowledgements

We thank Johny Acosta for assistance with computer issues; Marcelo Dourado Dora and Ana Paula Cardoso Pertence, who also performed sonographic examinations for this study; Anelise Burmeister for assistence in writing and proofreading the text; Mario Wagner for help with the statistical calculations; and Ana Lovatto for drawing Fig. 1.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Hospital da Criança ConceiçãoMinistério da SaúdePorto AlegreBrazil
  2. 2.Hospital São Lucas da Pontificia Universidade Católica do Rio Grande do SulPorto AlegreBrazil
  3. 3.Porto AlegreBrazil

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