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Contrast-enhanced abdominal CT performed for acute left-sided abdominal pain in a 56-year-old woman. a Upper sections show perirenal fat stranding (white arrows). Bilateral incidental parapyelic cysts are present. b Lower sections revealed “inflamed diverticulum” within the posterior wall of the descending colon (black arrow) confirming the diagnosis of left colonic diverticulitis with almost purely retroperitoneal involvement
