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Finding the appendix
[[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 (see also [[#Finding the appendix is often located in their vicinity]] below). 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.
===Finding 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. Look for a relatively small tubular structure. Juxtaposing serosal layers may mimic a longitudinal section of an appendix, but will not turn circular when rotating the probe 90°.
===Findings indicating appendicitis===
