Evaluation of suspected appendicitis in children using limited helical CT and colonic contrast material

OBJECTIVE. Colonic contrast material evaluation of suspected appendicitis i n pediatric patients is technically more challenging than in adults because less intraabdominal fat is present. To determine the accuracy and feasibil ity of focused CT for pediatric patients, we carried out this retrospective investigation. MATERIALS AND METHODS. Between November 1995 and July 1999, 199 pediatric p atients (1-18 years old; mean age, 12 years) were examined with focused CT in the emergency division for suspected appendicitis. The findings on CT we re compared with the findings at surgery, pathology, and clinical follow-up . RESULTS. There were 64 true-positive CT scans, two false-negative, 128 true -negative, one false-positive, and four indeterminate. Seventy-four patient s underwent appendectomy, with a negative appendectomy rate of 9%. One hund red twenty-five patients without appendicitis were treated nonoperatively. The true-positive rate was 32%, true-negative rate was 64%, sensitivity was 97%, specificity was 99%, positive predictive value was 98%, negative pred ictive value was 98%, and overall accuracy was 96%. Pediatric patients tole rated the procedure well. Colonic contrast material saved time and provided improved identification of the cecum and appendix. In 62 patients without appendicitis, focused CT provided alternative diagnoses. CONCLUSION. Focused CT appears to be nearly as accurate in pediatric patien ts as in adults. Focused CT provided alternative diagnoses in 48% of the pa tients for whom CT findings were negative for appendicitis.