A medical procedure using a flexible tube with a camera to visually examine the stomach and duodenum from the inside.
From 'gastro-' + 'duodenal' + '-scopy' from Greek 'skopein' meaning to look or examine. Modern medicine borrowed the Greek suffix to describe observation procedures.
This is one of the most common procedures doctors perform, yet it's less than 100 years old—before the invention of flexible tubes, doctors could only guess what was happening inside your stomach!
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