Long-term Outcomes of Ampullary Adenoma According to Resected Margin Status after Endoscopic Papillectomy.

: Although ampullary adenomas with positive or indeterminate margins after EP showed a higher rate of recurrence at long-term follow-up, endoscopic treatment was effective with favorable long-term outcomes. Submucosal injection prior to resection was associated with increased risk of recurrence and residual lesions.