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+Evaluation
*[[CT of appendicitis|'''CT''' of appendicitis]] is the preferable initial method in the elderly, who are less likely to develop adverse effects from the radiation dose.<ref name="HuiMajor2002">{{cite journal|last1=Hui|first1=Thomas T.|last2=Major|first2=Kevin M.|last3=Avital|first3=Itzhak|last4=Hiatt|first4=Jonathan R.|last5=Margulies|first5=Daniel R.|title=Outcome of Elderly Patients With Appendicitis|journal=Archives of Surgery|volume=137|issue=9|year=2002|issn=0004-0010|doi=10.1001/archsurg.137.9.995}}</ref> It is also indicated as initial exam in adults with more non-specific acute abdominal symptoms.
==FindingsEvaluation==[[File:UOTW 45 - Ultrasound of the Week 3.jpg|thumb|Ultrasound showing appendicitis and an appendicolith<ref name=UOTW45>{{cite web|title=UOTW #45 - Ultrasound of the Week|url=https://www.ultrasoundoftheweek.com/uotw-45/|website=Ultrasound of the Week|date=25 April 2015|deadurl=no|archiveurl=https://web.archive.org/web/20170509131322/https://www.ultrasoundoftheweek.com/uotw-45/|archivedate=9 May 2017|df=}}</ref>]]
[[File:Ultrasonography of a normal appendix, annotated.jpg|thumb|Ultrasound of a normal appendix for comparison]]
[[File:Ultrasonography of a normal appendix without and with compression.jpg|thumb|A normal appendix without and with compression. Absence of comprehensibility indicates appendicitis.<ref name="ReferenceA">{{cite journal|last1=Reddan|first1=Tristan|last2=Corness|first2=Jonathan|last3=Mengersen|first3=Kerrie|last4=Harden|first4=Fiona|title=Ultrasound of paediatric appendicitis and its secondary sonographic signs: providing a more meaningful finding|journal=Journal of Medical Radiation Sciences|date=March 2016|volume=63|issue=1|pages=59–66|doi=10.1002/jmrs.154}}</ref>]]
*Look for the appendix: A high frequency probe is preferable in children. The external iliac vessels are helpful in initial orientation, as the appendix is often located in their vicinity. :*If found:::Evaluate without and with compression.::If possible, follow it from end to end for complete evaluation.*Evaluate lymph nodes, mainly along the iliac vessels and aorta*Look for ascites at least in the recto-uterine or recto-vesical pouch. ===Findings indicating appendicitis===[[File:UOTW 45 - Ultrasound of the Week 3.jpg|thumb|Ultrasound showing appendicitis and an appendicolith<ref name=UOTW45>{{cite web|title=UOTW #45 - Ultrasound of the Week|url=https://www.ultrasoundoftheweek.com/uotw-45/|website=Ultrasound of the Week|date=25 April 2015|deadurl=no|archiveurl=https://web.archive.org/web/20170509131322/https://www.ultrasoundoftheweek.com/uotw-45/|archivedate=9 May 2017|df=}}</ref>]]
*Absence of compressibility<ref name=radiopaedia>{{cite web|url=https://radiopaedia.org/articles/appendicitis|title=Appendicitis|author=Dan J Bell and Koshy Jacob|website=Radiopaedia|accessdate=2018-06-25}}</ref>
*Dilatation >6 mm in outer diameter<ref name=radiopaedia/>
