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Arrowhead sign

Dr MT Niknejad and Dr Alexandra Stanislavsky et al.

The arrowhead sign refers to the focal caecal thickening centered on the appendiceal orifice, seen as a secondary sign in acute appendicitis. The contrast material in the cecal lumen assumes an arrowhead configuration, pointing at the appendix.

The arrowhead sign is applicable only when enteric contrast distends the caecum.