Fig. 7From: Ultrasound assessment of acute appendicitis in paediatric patients: methodology and pictorial overview of findings seena A transverse view of an inflamed appendix in a 15-year-girl, showing the target sign appearance. b Similar appearances in an 11-year-old boy. This target sign comprises a hypoechoic fluid-filled centre (white arrow), inner hyperechoic mucosal/submucosal ring (white asterisk), and outer hypoechoic ring (dashed white arrow)Back to article page