Endoscopical En Bloc resection of a large duodenal adenoma with focal high dysplasia : hydroxypropyl methylcellulose as a safe lifting agent in a large duodenal adenoma EMR.

Endoscopic mucosal resection is a potential alternative to surgery when submucosal invasion and lymph node involvement are excluded. We describe an en bloc resection of a large, focal, high-grade tubulovillous nonampullary adenoma of duodenal wall using hydroxypropyl methylcellulose as a lifting agent.