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n. an illuminated optical telescope used to inspect the interior of the gullet (oesophagus), stomach, and duodenum. For many years these were rigid or semirigid instruments affording only limited views, but modern fully flexible instruments, which transmit the image using miniaturized video cameras, allow all areas of the oesophagus, stomach, and the first and second parts of the duodenum to be seen and photographed and specimens taken for microscopic examination. Therapeutic procedures (e.g. to arrest haemorrhage, remove a polyp, produce a gastrostomy, dilate a stricture, or insert self-expandable metal stent) may be performed. As the same instruments can usually be introduced into the duodenum they are also known as gastroduodenoscopes or oesophagogastroduodenoscopes. —gastroscopyn.

Subjects: Medicine and Health.

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