The image and the video display the catheter spraying the methylene blue. Chromoendoscopy. Chromoendoscopy has been applied in a variety of clinical settings and throughout all gastrointestinal tract segments that are accessible to the endoscope. Interest has been renewed in recent years in part because of the development of new technologies such as endoscopic mucosal resection and photodynamic therapy, which require precise visual tissue characterization.
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