• Feng Chi, Xiang Wang, Yuefu Lan, Liangxian Jiang, and Shenkang Zhou.
• Department of Gastrointestinal Surgery, Taizhou Hospital, Zhejiang University, China.
• J Coll Physicians Surg Pak. 2020 Nov 1; 30 (11): 1161-1165.

ObjectiveTo compare the superior mesenteric artery (SMA) and inferior mesenteric artery (IMA) diameters in colorectal cancer compared to control.Study DesignObservational study.Place And Duration Of StudyTaizhou Hospital, Zhejiang University, Taizhou, China, from March 2019 to June 2020.MethodologyA total of 203 diagnosed colorectal cancer patients and 40 patients as control subjects were reviewed. Patients were divided into three groups based on tumor location as the right colon, left colon, and rectal groups. The diameters were measured on axial computed tomography images independently by two observers.ResultsThe SMA diameter did not differ between the right colon and control groups (p=0.626). The IMA diameter was significantly higher in the left colon group than in the control group (p=0.002), but there was no significant difference in the IMA diameter between the different tumour stages (p=0.263). The IMA diameter was significantly higher in the rectal group than in the control group (p<0.001). There was a significant increase in the IMA diameter from stage I to stage II rectal cancers (p=0.022) and from stage II to stage III rectal cancers (p=0.003). The IMA diameter did not differ between stage III and IV rectal cancers (p=0.600). In locoregional rectal cancer patients, there was a significant correlation between the IMA diameter and tumour-node-metastasis stage (p<0.001, rs = 0.494).ConclusionPatients with rectal cancer and left colon cancer have a wider IMA diameter than patients without colorectal cancer. IMA diameter can be a potential marker for locoregional staging of rectal cancer. Key Words: Superior mesenteric artery, Inferior mesenteric artery, Colorectal cancer, Markers, Diameter.

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