Enhanced visualization of vessels in submucosa by amber red color imaging in colonic endoscopic submucosal dissection

Intraoperative bleeding is a major complication of endoscopic submucosal dissection (ESD). Various devices and techniques have been developed to control intraoperative bleeding 1 2 3 4. Amber red color imaging is a recently developed observation modality that integrates brightness and color-enhancement technology used in linked color imaging, characterized by an increased proportion of long-wavelength relative linked color imaging, which targets the mucosa 5. These amber red color imaging features improve the visibility of blood vessels and active bleeding points in the deep submucosa. Herein, we present a case of a colonic laterally spreading tumor that was treated with ESD using amber red color imaging (Video 1).