Large dilated appendicitis
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There is a fluid filled dilated (20mm calibre) blind ending structure in the RIF which is probably arising from the caecal pole, rather than the terminal ileum. No calcification or wall thickening / irregular. No surrounding RIF fat stranding or fluid. I favour this to represent an appendiceal mucocoele rather than acute appendicitis.
Solid organs are unremarkable. No free fluid or gas. Lung bases are clear. Bones normal.
"Appendix mucocele": An appendix 40x14x14mm with attached mesoappendix up to 25mm and attached piece of caecum 30x14x13mm. Caecal margin inked black. The mucosa is tan and the serosa is congested. Tumour or mucus is not seen. There is no perforation.
Sections of appendix and attached large bowel show intact appendiceal mucosa with focal acute inflammation including crypt abscesses and a mild to moderate transmural acute inflammatory cell infiltrate. Perforation is not seen. The lumen is not distended by mucus and there is no dysplasia. There is no evidence of malignancy.
Appendix: Acute appendicitis. No evidence of a neoplasm.