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Dilatation of appendix and periappendiceal mesenteric fat stranding with an appendicolith in the appendiceal lumen. Mesenteric lymphadenopathy is distinguishable in the adjacent mesenteric fat.
Inflammation at the base of the appendix produces an 'arrow-like' collection of caecal contrast.
Local dilatation of the right ureter near the inflammation site is likely to represent a local response to the adjacent inflammation.