Imaging evaluation of suspected appendicitis in a pediatric population: Effectiveness of sonography versus CT

OBJECTIVE, The purpose of this study was to compare the diagnostic accuracy of graded compression sonography with that of helical CT for the diagnosis of appendicitis in a pediatric and young adult population. SUBJECTS AND METHODS. Between June 1996 and April 1999, 386 pediatric and y oung adult patients with suspected appendicitis were examined using sonogra phy, CT, or both: 233 underwent sonography only, 71 underwent CT only, and 82 underwent sonography and CT. All sonograms and CT scans were prospective ly interpreted as showing positive or negative findings fur appendicitis by one of six pediatric radiologists. CT and sonographic findings were correl ated with surgical and histopathologic findings or findings at clinical fol low-up. RESULTS. Helical CT had a significantly higher sensitivity (95% versus 78%, p = 0.009) and accuracy (94% versus 89%, p = 0.05) than graded compression sonography for the diagnosis of appendicitis in children, adolescents, and young adults. The specificity of both techniques was 93%. Twenty of 82 pat ients who underwent both sonography and CT had discordance between the find ings of the two examinations. The CT results were correct in a significantl y greater number of patients with discordant examinations (17/20 patients [ 85%]). CONCLUSION. Helical CT has a significantly higher sensitivity and accuracy than graded compression sonography for the diagnosis of appendicitis in a p ediatric and young adult population, particularly in children more than 10 years old.