Epiploic appendagitis - ascending colon
Citation, DOI and case data
Right flank pain.
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Ovoid structure of fat-density lateral to the ascending colon with a thin peripheral hyperdense rim "hyperattenuating ring sign", and small central hyperdense dot (most likely representing a thrombosed vascular pedicle), and surrounding inflammatory fat stranding.
CT features most consistent with epiploic appendagitis.