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Fig. 4. —42-year-old man with diverticulitis, left-sided flank pain, and suspected kidney stone. CT scan using scan protocol I shows inflamed diverticulum with increased attenuation (arrow). Note inflammation of surrounding fat and thickening of Gerota's and lateroconal fasciae. In patients with sufficient intraabdominal fat, diagnosis can be made without oral, rectal, or IV contrast material.