Primary Outcome: To be meaningful to parents of, and clinicians treating, children with acute appendicitis, the primary outcome is treatment failure defined as: (i) any additional intervention related to appendicitis requiring general anesthesia within 1 year of randomization (including recurrence of appendicitis after non-operative treatment, which we will treat with appendectomy) or (ii) negative appendectomy. Secondary outcomes are: (i) complications; (ii) time to discharge following randomization; (iii) number and duration of hospital admissions.