Prediction and Treatment of Difficult Cases in Colorectal Endoscopic Submucosal Dissection

Figure 1

Classification about fibrosis of the submucosal layer F0: no fibrosis, manifested as a blue transparent layer, F1: mild fibrosis that appears as a white web-like structure in the blue submucosal layer, and F2: severe fibrosis that appears as a white muscle-like structure without a blue transparent layer in the submucosal layers.