Chromoendoscopy| Chromoendoscopy in Barrettīs epihelium | |
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| The right picture shows methylenblue- staining of a Barrettīs esophagus. Normal squamous epithelium is stained only weakly, whereas Barrettīs epithelium takes up more dye. Weakly stained areas within the Barrett epithelum would represent centers of dysplasia. | |
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Occasionally mucus adherent to the mucosa is taking up dye. Applying a dilution of acetylcystein prevents this false positive staining to occur. |
