PMC3578668_01
CT of abdomen showing free air in right para-renal space (white arrow).
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A computed tomographic (CT) scan of her abdomen and pelvis was arranged, which showed abnormal areas of low attenuation and multiple pockets of air in the right flank, surrounding the right kidney and in the right sub-hepatic space, consistent with a perforation of either the ascending colon or the duodenum (Fig. 1).