Endoscopic mucosal resection of sporadic duodenal nonampullary adenoma: outcomes of 130 patients with a long-term follow up in two tertiary French centers.

Background: The long-term outcomes and safety of endoscopic mucosal resection (EMR) of sporadic duodenal adenoma (SDA), and the management of adverse events need to be confirmed.

Methods: A bicentric retrospective study was performed including all patients who underwent EMR for SDAs from 2003-2016. The primary aim was to evaluate the efficiency of EMR for SDA. The secondary objectives were to assess safety, recurrence management, predictive factors for treatment success, and adverse events.

Results: One hundred thirty patients (134 procedures) were included (median age 65 years, 49.3% male). The mean SDA size was 20.7 (range 5-50) mm. Of the SDAs, 58.2% were category 3 of the Vienna classification, 35.8% were category 4, and 5.9% were category 5. The median follow up was 25.0 (range 2-120) months. Complete mucosal resection was achieved for 129/134 lesions (96.2%), with en bloc resection in 59/134 (44%). Recurrence occurred in 28.6% of cases (30/105 procedures). Recurrence was successfully treated by new endoscopic procedures in 72.2% (13/18) and by surgery in 27.8% (5/18). Delayed bleeding occurred in 13.4% of cases (18/134) and was successfully managed endoscopically. The perforation rate was 3.7% (5/134); perforations were managed without surgery in 60% (3/5 patients) of cases.

Conclusions: Endoscopic treatment of SDA appears to be effective and relatively safe in tertiary centers. All bleeding complications were endoscopically controlled, and perforation was rare. Recurrence was frequent but could be managed endoscopically. EMR is confirmed as a first-line treatment in cases of SDA, and surgery is useful only if repeated EMRs fail.