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duodenoscope (dew-ŏ-deen-ŏ-skohp) n. a fibreoptic or video instrument for examining the interior of the duodenum. An end-viewing instrument is used for most examinations, but a side-viewing instrument is used for endoscopic retrograde cholangiopancreatography (see ERCP). The end-viewing instrument is also used for examination of the stomach (gastroduodenoscope) and it is usual to combine the two examinations (gastroduodenoscopy).