Table 1.

The definition criteria of EUS characteristics

EUS characteristics	Definitions
Diffuse hypoechogenicity	Reduced echogenicity involving>1/2 of pancreas (head/body, body/tail, or entire pancreas)
Focal hypoechogenicity	Reduced echogenicity involving≤1/2 of pancreas (head, body or tail)
Diffuse enlargement	Enlargement involving>1/2 of pancreas (head/body, body/tail or entire pancreas)
Focal enlargement	Enlargement involving≤1/2 of pancreas (head, body, or tail)
Peripancreatic hypoechoic margin	A capsule-like hypoechoic rim surrounding pancreas
Common bile duct dilation	Common bile duct diameter≥8 mm
Bile duct wall thickening	The hypoechoic intermediate layer of the bile duct is clearly thickened
Lymphadenopathy	Lymph node diameter≥8 mm with hypoechoic texture
Vessel involvement	Loss of interface between the pancreas and vessels of portal system