Main pancreatic duct dilatation 의 정의
Maximal diameter 가 3mm 이상
또는
Pancreatic duct 의 Narroewst poration 보다 2mm 이상 dilatation 되어있을때
Main pancreatic duct dilatation 의 원인
Benign
(1) Chronic pancreatitis
(2) Pancreatobiliary maljunction
(3) Pancreatic divisum
(4) Post-traumatic pancreatic duct stricture
(5) Senile change
(6) Autoimmune pancreatitis
(7) Periampullary diverticulum
Malignant
(1) IPMNs
(2) Pancreatic intraepithelial neoplasms (PanINs : premalignant)
(3) Pancreatic cancer
(4) Neuroendocrine tumor (rarely)
(5) Solid papillary tumor
Main pancreatic duct dilatation 시 악성을 구분하는 소견
Benign
Transition site : smoothly tapered narrowing
Duct penetration sign positive
Malignant
Transition site : Abrupt narrowing, longer than the benign group
Duct penetration sign negative
