ultrasound for appendicitis

6 Mar

recent JEM article, good for background and pictures, with their study proposing 7mm outer appendiceal diameter on ultrasound vs. 6mm currently used cutoff.

Thought it was a good chance to review some basic numbers and throw up some visual aids on appendiceal ultrasound.

current widely accepted outer diameter cutoff: 6mm


  • sensitivity 88%
  • specificity 94%


  • sensitivity 83%
  • specificity 93%


a picture’s worth…



References: JEM article; ACEP “Focus” w/some pictures; appendix tip picture; perf picture




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