PMC5524425_01
(A) In Case 1, colonoscopy showed a type II tumor located 50 cm from the anal verge. (B) In Case 2, colonoscopy showed a laterally spreading tumor located in the cecum.
gr1.jpg
PMC5524425_02_gr1.jpg
fig0005
Colonoscopy revealed a laterally spreading tumor in the cecum (Fig. 1B).
(A, B) Abdominal enhanced computed tomography showed that the superior mesenteric vein (SMV) was located on the left side of the superior mesenteric artery (SMA) (SMV rotation sign) in both cases.
gr2.jpg
PMC5524425_02_gr2.jpg
fig0010
However, a retrospective review of the CT image demonstrated that the SMV was located on the left side of the SMA and that the small intestine and colon occupied the right and left sides of the abdominal cavity (Fig. 2B).
(A, C) Intraoperative examination revealed that the small intestine occupied the right side of the abdomen in both cases. (B) In Case 1, the ileocecal region was located along the midline of the abdomen, and the preoperative marking for the tumor was found in the ascending colon. (D) In Case 2, Ladd's bands were lying in front of the duodenum.
gr3.jpg
PMC5524425_02_gr3.jpg
fig0015
A further search of the intraperitoneal region showed that Ladd's bands were lying in front of the duodenojejunal junction, and the duodenum (which was free from the retroperitoneum) passed straight down to join the jejunum to right upper quadrant (Fig. 3C, D).
PMC5524425_02
(A) In Case 1, colonoscopy showed a type II tumor located 50 cm from the anal verge. (B) In Case 2, colonoscopy showed a laterally spreading tumor located in the cecum.
gr1.jpg
PMC5524425_02_gr1.jpg
fig0005
Colonoscopy revealed a laterally spreading tumor in the cecum (Fig. 1B).
(A, B) Abdominal enhanced computed tomography showed that the superior mesenteric vein (SMV) was located on the left side of the superior mesenteric artery (SMA) (SMV rotation sign) in both cases.
gr2.jpg
PMC5524425_02_gr2.jpg
fig0010
However, a retrospective review of the CT image demonstrated that the SMV was located on the left side of the SMA and that the small intestine and colon occupied the right and left sides of the abdominal cavity (Fig. 2B).
(A, C) Intraoperative examination revealed that the small intestine occupied the right side of the abdomen in both cases. (B) In Case 1, the ileocecal region was located along the midline of the abdomen, and the preoperative marking for the tumor was found in the ascending colon. (D) In Case 2, Ladd's bands were lying in front of the duodenum.
gr3.jpg
PMC5524425_02_gr3.jpg
fig0015
A further search of the intraperitoneal region showed that Ladd's bands were lying in front of the duodenojejunal junction, and the duodenum (which was free from the retroperitoneum) passed straight down to join the jejunum to right upper quadrant (Fig. 3C, D).