Endoscopic Submucosal Injection of Indocyanine Green Before Laparoscopic Radical Resection for Colorectal Cancer

Indocyanine green was injected under endoscope within 24 hours before operation. Four points were evenlyinjected in four quadrants at the edge of the tumor. The patients with obstruction were injected at two points on the anal side of the tumor. The diluted concentration of indocyanine green was 0.625mg/ml or 1.25mg/ml. The injection method was direct submucosal injection and sandwich method. According to the imaging effect, it can be divided into local imaging and lymphatic drainage imaging. Tumor body: 0, no imaging; 1, full imaging; 2, diffuse imaging, overflow, interference with other areas of observation. Lymph drainage area imaging 0, no imaging; 1, full imaging; 2, diffuse imaging, overflow, interference with other areas of observation.