Appendix

Normal Appendix
Modality Transverse Diameter (mm) Appendiceal wall thickness (mm)
US < 6 (and compressible) Usually < 2
CT < 8   < 2 - 4

 
References:
1. Kao SC, Smith WL, Abu-Yousef MM, et al.  Acute appendicitis in children: sonographic findings.  AJR 1989; 153:375-379.
2. Curtin KR, Fitzgerald SW, Nemcek AA, Hoff FL, Vogelzang RL.  CT diagnosis of acute appendicitis: imaging findings.  AJR 1995; 164:905-909.

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