Figure 1:

Flow diagram shows three imaging strategies for suspected acute appendicitis: (a) CT alone, (b) combined US and CT, and (c) MR imaging alone. Patients who underwent CT alone were triaged to surgery for appendectomy if they had positive results; patients with negative results did not undergo surgery. For the combined US and CT approach, patients underwent US, with triage to CT in circumstances of negative or indeterminate US results. Patients who underwent MR imaging alone were triaged to surgery for appendectomy if they had positive results; patients with negative results did not undergo surgery.