[The application of laser rays in gastroenterology].

After reminding the difference between the surface electro-coagulation-section and the photo-coagulation "at distance" by Laser-ray, the author underlines that the most interesting indications of the Laser-ray introduced into the digestive endoscopes are the destruction of esophageal and colonic tumors for inoperable patients or patients with operative risks. The palliative destructions avoid mutilating operations which won't increase the survival time of the patients.