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Endoscopy is an examination using a tube-like device with a light on the end. A camera at the end of the tube transmits the lighted image before the tube to a TV screen so the the examiner can see the inside of the upper gastrointestinal tract as the tube advances.
The basic structure of an endoscope is a camera at the end of a tube with a light source and a biopsy needle that will help to take the tissue samples. Endoscopy is the procedure to visualise the food canal using endoscope. The upper GI endoscopy is now commonly referred as Endoscopy.