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1.Overviewrn2.Diagnosisrn2.1 Clinical manifestationsrn2.2 Disease history and family historyrn2.3 Physical examinationrn2.4 Clinical laboratory examinationsrn2.5 Endoscopyrn2.6 Imagingrn2.6.1 Common testingrn2.6.2 Imaging evaluation of clinical crucial issues in colon cancerrn2.6.3 Imaging evaluation of clinical crucial issues in rectal cancerrn2.6.4 MRI structural report of rectal cancer is recommendedrn2.6.5 CT structural report of colon cancer can be usedrn2.7 Histopathological examinationrn2.8 Open surgery or laparoscopic exploration