Endoscopic mucosal ablation: a novel technique for a giant nonampullary duodenal adenoma
25. Februar 2013 (online)
Piecemeal endoscopic mucosal resection (p-EMR) for large sessile or flat duodenal polyps results in a high incidence of bleeding . A novel injection and ablation technique, endoscopic mucosal ablation (EMA), was used to eradicate a benign sporadic nonampullary duodenal adenomatous polyp. EMA comprises two conventional modalities: submucosal fluid injection followed by high power argon plasma coagulation (APC) tissue ablation ([Fig. 1]). The fluid-filled submucosal cushion absorbs thermal energy and protects the underlying thin duodenal muscle layer: providing a heat-sink effect  . The entire mucosal layer progressively “melts” with lateral propagation of the thermal energy within the duodenal submucosal layer giving a macroscopic appearance of a honeycomb ([Fig. 2]) .
A hemicircumferential, 45-mm, nongranular lateral spreading tumor was identified in the postampullary segment of the duodenum in a 76-year-old woman. A pediatric endoscope (LUCERA PCF240DL; Olympus KeyMed, Southend-on-Sea, UK) was used to achieve stable access for the endoscopic therapy. The polyp was scrutinized with narrow band imaging (NBI) and was seen to have a benign vascular and crypt pattern (type IV). The lesion was lifted entirely with submucosal injection of 25 ml diluted adrenaline (1/200 000) mixed with methylene blue. Representative polyp pieces were removed by p-EMR using a 10-mm snare (SnareMaster kit, Olympus KeyMed).
EMA was finally applied to the remaining 90 % of the polyp using high power APC of 45 W, on forced coagulation and a flow rate of 2 L/minute (ICC 200 and APC 300; ERBE, Tübingen, Germany), until no visible viable polyp was observed ([Fig. 3]; [Video 1]). The time required to complete the destruction of the polyp was 13 minutes. Histological analysis showed a tubulovillous adenoma with low grade dysplasia. The patient was discharged the following day on a 2-week course of proton pump inhibitors.
No intraprocedural or delayed complications occurred. At the 6 month check, both NBI and indigo carmine (0.1 %) dye assessment revealed a completely healed scar with a tiny 4-mm area of residual polyp that was treated with EMA.
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