Ampullary neoplasia is rare — under one per cent of gastrointestinal cancers — but incidence in young adults has risen over two decades, and guidance has lagged behind the rest of pancreaticobiliary practice. This American Gastroenterological Association clinical practice update issues fifteen best-practice statements, drawn from literature review and expert opinion rather than systematic review, so without formal evidence grading.
The assessment rules come first because most errors happen there. Use a side-viewing duodenoscope, not a forward-viewing gastroscope: the ampulla cannot be adequately seen or biopsied otherwise, and the side-viewing approach lets you biopsy away from the pancreatic orifice. Take at least six biopsies, targeting ulcerated or indurated areas, because 20% to 40% of these adenomas already contain malignancy. Use endoscopic ultrasound for staging and intraductal extension in anything being considered for endoscopic resection, except lesions under 1 cm with no worrying features.
The technical statements are where a service can audit itself. Lesions suitable for endoscopic papillectomy have well-defined margins, are under 4 to 5 cm, non-friable, soft to probing, with intraductal extension of 1 cm or less; more than 1 cm of intraductal extension warrants surgical consultation. Do not perform pre-papillectomy biliary or pancreatic sphincterotomy, because electrocautery artefact and bleeding wreck the histology. Resect en bloc where feasible; submucosal injection is usually unnecessary. Prevent post-papillectomy pancreatitis with pancreatic duct stenting, rectal non-steroidal anti-inflammatories and high-volume lactated Ringer's. Surveillance runs from three months, then six and twelve, then annually for at least five years.
- Use a side-viewing duodenoscope for any suspected ampullary lesion
- Take at least six biopsies, targeting ulcerated or indurated areas
- Do not sphincterotomise before papillectomy — it destroys the histology you are resecting for
- Use the three-part prophylaxis for post-papillectomy pancreatitis: duct stent, rectal NSAID, aggressive hydration
- Book the three-month surveillance duodenoscopy at the time of resection
Why it matters
Up to two in five of these adenomas already contain cancer, and a forward-viewing scope cannot tell you which.
Don't overread it
These are best-practice advice statements from expert opinion without formal evidence grading — not a graded guideline.
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