Sigmoidoscopy, sigmoidoscopy or rectosigmoscopy is an instrumental method of examining the end part of the main part of the large intestine, the sigmoid colon (colon sigmoideum), which passes directly into the rectum.
By gastroscopy is meant a procedure in which the shells and cavity of the esophagus and stomach are examined. The area of the duodenum is also affected. In some cases, gastroscopy allows you to visualize the image and display it on the screen.
Gastroscopy is one of the varieties of endoscopic research, in which the gastric mucosa and intestines are studied with the help of special equipment. The main instrument used for gastroscopy is the fibrogastroscope.