Table 1.

Baseline Characteristics of Study Population and Ampullary NETs.

Parameter Overall (n=14) % or IQR
Population characteristics
 Age (year, median) 62.5 52.3–72.8

 Sex (M/F) 7/7 50%/50%

Pre-endoscopic staging
 Lesion size (mm, median) 18 15–24.5

 Main pancreatic duct dilation (>5 mm) 2 14.3%

 Bile duct dilation 5 35.7%

 Intraductal extension 3 21.4%

 Intraductal extension (mm, median) 5 3–14

Histology on pre-papillectomy biopsies
 LGD adenoma 4 28.6%

 HGD adenoma 1 7.14%

 Adenocarcinoma 0 0%

 NET (non-functional) 2 14.3%

 Other (non-specific findings) 7 50%

HGD, high-grade dysplasia; LGD, low-grade dysplasia; NET(s), neuroendocrine tumor(s).

RMMJ Rambam Maimonides Medical Journal Rambam Health Care Campus 2026; 17(1): e0001. ISSN: 2076-9172
Published online 2026 January 28. doi: 10.5041/RMMJ.10562