Careful Observation Using Magnifying Endoscopy Before Choice of Treatment Strategy for Early Colorectal Lesions

Many studies have shown that histology of a colorectal lesion or even whether endoscopic resection is suitable for a suspected colorectal cancer could be accurately diagnosed by careful observation before treatment [1–6]. The morphological parameters observed under white light endoscopy could help in delineating the risk of invasion and the depth of invasion. It has been reported that expansion appearance, deep and irregular depression surface, folds converging toward the tumor, non-lifting sign, submucosal mass-like elevation or large nodule, and depression in laterally spreading tumors (LSTs) are risk factors for deep invasion [1–6].