DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Doctor watching the screen while carrying out an endoscope examination. An endoscope is a flexible camera through which internal cavities can be viewed. The camera view is displayed on-screen. This technique allows a doctor to evaluate the inside of the gastrointestinal tract. Endoscopy is routinely used in the diagnosis of cancer and ulcers.
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