Tattooing gone wrong
Endoscopic tattooing of colonic lesions has become common practice. The dyes selected for tattooing differ depending on what the purpose of the tattoo is. Large polyps for which endoscopic mucosal resection (EMR) is planned are tattooed with diluted methylene blue. This temporarily stains the muscularis propria of the bowel wall and helps safeguard against full thickness resection. The tattoo disappears within a few hours.
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