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There is a large fluid collection just anterior to the right psoas muscle (see circle below.)
A CT scan with both oral and IV contrast would be preferred. Oral contrast helps differentiate structures from within and outside of the intestine. It may also help reveal the presence of a fistula or other disruption of the bowel wall. IV contrast may enhance the abscess by concentrating the contrast material within the abscess wall. In a study without contrast such as this, fat-stranding around around the abscess is a key finding.