Differentiation of Tubular Adenoma and Colonic Innominate Groove Under EC Endoscopy

Inclusion Criteria: * Cases of colorectal polyps discovered in our hospital and undergoing EC endoscopic examination. Exclusion Criteria: * 1.Suffering from hereditary polyposis or inflammatory bowel disease, severe intestinal inflammation, or difficulty recognizing normal intestinal mucosa; 2\. History of methylene blue allergy; 3\. Patients who have participated or are currently participating in other clinical trials within the first 4 weeks of enrollment;