An 80-year-old woman with a flat duodenal tubulovillous adenoma presented for endoscopic mucosal resection (EMR). This lesion had received treatment with EMR and Nd:YAG laser in the past. The lesion was located in the proximal second portion of duodenum (D2), measured approximately 2 cm, and was half-circumferential from the 12-o'clock to the 6-o'clock position.
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Samarasena et al. (2012) studied this question.