Stalked Polyp of the Sigmoid Colon. For methylene blue staining, the patient should be told that the urine and stool might adopt a blue color. The enemy of good chromoendoscopy is surface mucus, blood, or retained food material. The surface to be examined after application of dye should be washed. For the vital/absorptive dyes (e.g., Lugol’s iodine, methylene blue).
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