<unk>  using Lugol's iodine in the esophagus. The image on the left uses regular white light endoscopy. The image on the right stains with Lugol's iodine, and identifies a squamous cell carcinoma, which does not pick up the stain.<unk>  is a medical procedure wherein dyes (often the same stains used in histology) are instilled into the gastrointestinal tract at the time of visualization with fibre-optic endoscopy. The purposes of<unk>  is chiefly enhance the characterization of tissues, although dyes may be used for other functional purposes. The detail achieved with<unk>  can often allow for identification of the tissue type or pathology based upon the pattern uncovered.
Chromoendoscopy
Nasoendoscopy
Sialoendoscopy
Autoscopy
Capsule endoscopy
Gonioscopy
Anomaloscope
SurgiScope