Fig. 1

Case 1: a case of upper rectal cancer with postoperative stenosis of the reconstructed colon. a Preoperative computed tomography (CT)-colonography shows the PDM. The black arrow shows sigmoid colon cancer. b During laparoscopic surgery, the root of the inferior mesenteric artery (IMA) was cut. c Colonoscopy shows postoperative stenosis of the reconstructed. d–f CT shows colonic dilatation caused by stenosis of the reconstructed colon. d The white arrow shows colonic stenosis and dilatation of the oral side. e The white arrows show the clips on the IMA (left) and left colic artery (LCA) (right). The contrast enhancement at the distal side of the reconstructed colon was weak. f The white arrow shows the staple line at the anastomosis