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caecal bar sign is a secondary sign in acute appendicitis. It refers to the appearance of inflammatory soft tissue at the base of the
appendix, separating the appendix from the contrast-filled cecum.
1. Pinto leite N, Pereira JM, Cunha R et-al. CT evaluation of appendicitis and its complications: imaging techniques and key diagnostic findings. AJR Am J Roentgenol. 2005;185 (2): 406-17. AJR Am J Roentgenol (full text) - Pubmed citation