Preoperativelocalization of colorectal cancer tumor in Mongolian patients using colonoscopy and computed tomography / Монголын Анагаах Ухаан

ABSTRACT

Purpose: To evaluate colorectal cancer localization in preoperative patients in Mongolia using CECTand endoscopyMaterials and Methods: Totally 10575 optic colonoscopy examinations were performed at UlaanbaatarSongdo Hospital between January 2009 and December 2012. From these examinations, colorectal cancerwas detected in 218 cases; from them 175 had CT examinations. From patients with CT examinations,111 underwent surgery at UBSH, National Cancer Center, State Central Hospital. (64MDCT SiemensSomatom). Only 86 patients with colorectal carcinoma proved by endoscopic or operative pathologywere included into this study. We retrospectively reviewed from the UBSH’ database their preoperativeCT, colonoscopy, surgical and pathohistologic reports using PACSPLUS, OCS operation systems. Toclassify colorectal tumor localization, we divided colon into 8 anatomic parts. The size of tumor wasmeasured as longest dimension visible on CT examination.Results: Study population’s age range was 25-87 age (mean 61.3years ±13.7SD). F M= 48 (55.8%)38 (44.2%). Urban residents composed 58 (67.4%), rural- 27 (31.4%), foreigner- 1 (1.2%). Tumor sizerange on CT was 0-13 ñì (mean 6.5±2.2 ñì) . Colonoscopy and CT detected colorectal cancer in rectumin 30(34.9%) and 31 (36.1%), in sigmoid colon in 21(24.4%)’’’ and 19(22.1%), in hepatic flexure- 9(10.5%) and 9(10.5%), retrospectively. Double (synchronous) colorectal cancer was detected in 1(1.1%)at colonoscopy and in 2 (2.2%) at CT.Conclusions: The 60-69 age group composed the largest group (38.4%) in colorectal cancer patients,with slight predominance of urban residents over rural and higher female predilection. Sigmoid andrectum are shown to have highest incidence in colorectal cancer. To our best knowledge, it is firstpublication on detection of synchronous colorectal cancer in Mongoliaby both CT and colonoscopy.CT examination is less risky and reliable method to evaluate the entire colonic length in patients withcolorectal cancer suspicion, if observers are skilled in detection of CT signs of colorectal cancer.