Acute abdominal pain
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No radiopaque calculus within the urinary tract. No collecting system dilatation. There is some perinephric stranding around the right kidney but there is also thickening of Gerota's fascia and inflammatory fat stranding in the pericolic fat anterior to this. This relates to a cavity containing fluid and gas behind the caecum and the ascending colon. It measures 30 x 35 mm in diameter and extends for 90 mm craniocaudal, most likely representing a periappendiceal abscess. A 12 x 6 mm calcified focus is seen within it medially
There are some prominent ileocolic lymph nodes medially.
The solid upper abdominal organs are unremarkable.
No other significant abdominal or pelvic finding. No bony abnormality.
Summary: Retrocaecal/retrocolic appendix abscess.