Ultrasound of the normal appendix: The how and why

C. L. Rapp, A. Thomas Stavros, P. R. Meyers

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Sonography now plays a vital role in noninvasive evaluation of patients with right lower quadrant pain. Sonography can differentiate appendicitis from other etiologies of pelvic pain, such as ovarian cysts, tubo-ovarian abscesses, inguinal hernias, and uterine pathologies. Successful demonstration of a normalized appendix virtually excludes appendicitis in the patient with right lower quadrant pain. False-negative examinations may occur because of bowel gas interference, stool, perforation with decompression of the appendix, or inflammation of the appendix without abnormal enlargement. The purpose of this study was two-fold: to determine how often a normal- sized appendix is demonstrable in patients who do not have appendicitis; and to determine whether locating a normal appendix improves the negative predictive value for the absence of appendicitis.

Original languageEnglish (US)
Pages (from-to)195-201
Number of pages7
JournalJournal of Diagnostic Medical Sonography
Issue number5
StatePublished - 1998
Externally publishedYes


  • Appendicitis
  • Inflammation
  • Mesoappendix
  • Negative predictive value

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


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