Abstract
Increasing familiarity with advanced endoscopic excision techniques allows for more colorectal lesions to be removed without major surgery. Endoscopic excision with negative margins is adequate for most polyps and low-risk T1 cancers. The use of modern polyp classification techniques based on size, morphology and pit pattern by an experienced endoscopist allow for an optical diagnosis of these lesions and can predict, with high accuracy, which lesions contain malignant disease and the level of invasion. A surgeon endoscopist must be able to recognize which complex polyps can be resected with advanced polypectomy techniques and which require upfront surgery. We aimed to provide an overview of polyp classification techniques to help surgeons select the correct treatment algorithm for advanced colorectal lesions based on their visual characteristics at index endoscopy.