Along with the development of modern medicine, endoscopic techniques of esophagus, stomach, duodenum with narrow band of light (NBI) have created a breakthrough in the screening and diagnosis of gastrointestinal cancer. at an early and very early stage.

Surgery is the indicated treatment for about 80% of patients with colorectal cancer that has not metastasized, however, even when radical surgery is combined with chemotherapy and radiation, the possibility of colorectal cancer is high. Recurrence of the rectum is still very high if the disease is not monitored and screened periodically after surgery. Laparoscopic method is included in the screening techniques for colorectal cancer after surgery.

Flexible esophagoscopy is a method that uses a flexible endoscope with a camera and light attached to the tip, passing through the throat and along the length of the esophagus. This endoscope has a small diameter, can control the direction and viewing angle, so it can observe and detect very small lesions of the esophagus and can intervene immediately when needed.