Figure 2).

A Axial T2 half-Fourier acquisition single-shot turbo spin-echo (HASTE) image demonstrating abnormal descending colon (black arrow) and extensive retroperitoneal inflammatory process (white arrow). B Axial contrast-enhanced volumetric interpolated breath-hold examination image showing enhancement of thickened descending colon wall (black arrow) and diffuse enhancement of the retroperitoneal inflammation (white arrow) suggesting phlegmon rather than abscess that would rim enhance around any pus collection