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To evaluate common pattern of 3-dimensional vascular structure around SMA and SMV.During laparoscopic surgery for ascending or transverse colon cancer, all vessels around main vascular trunks were skeletonized and we analyzed vascular patterns of 112 patients.In 87 candidates, ileocolic vessels were type A (ileocolic artery crossing SMV anteriorly) in 39 (44.8%) and type B in 48 (55.2%). In 90 patients, 35 (38.9%) had a RCA which crossed the SMV anteriorly in 29 (87.9%) and posteriorly in 4 (12.1%). In 78 patients, 72(92.3%) had a gastrocolic trunk (GCT) and the vascular composition of GCT showed five patterns (I: gastroepiploic vein (GEV), pancreatic vein(PV), right colic vein (RCV) in 45(65.2%); II:GEV, RCV in 16(23.2%); III:GEV, PV in 6(8.7%); IV: GEV,PV, MCV in 1(0.15%); V:GEV,RCV,MCV in 1(0.15%). In 88 candidates, 81 (92%) had only one MCA but 7 (8%) had two MCAs. In 89 patients, 81(92%) had only one MCV. Most of MCVs drained directly into SMV (77/79: 97.5%). In 76 patients, 60 (78.9%) had only one RCV and 14 (18.4%) had two RCVs.Our study showed that thepresence of RCA is relatively common. The MCV is not a component of the gastrocolic trunk in most patients. Further discussion about the implications of these variants is required.