case_images: PMC4396719_01
case_images: (a) Rectosigmoid perforation under peritoneal reflection and free air in retroperitoneal space. (b) Para-aortic and pararenal free air.
case_images: CRIS2015-364576.001.jpg
case_images: PMC4396719_01_CRIS2015-364576.001.jpg
case_images: fig1
case_images: The patient then underwent urgent contrasted computed tomography of the abdomen and revealed large amount of air in the retroperitoneal space but no signs of peritoneal perforation were detected (Figures 1(a) and 1(b)).