Table 2. Characteristic Imaging Features of Each of Solid Pancreatic Lesions Used for Making Specific Diagnosis.

Diagnosis	Characteristic Imaging Features
PDAC	Low signal intensity on fat suppressed T1W images
	Poor enhancement on dynamic studies
	Ill-defined margin
	Upstream pancreatic ductal dilatation and parenchymal atrophy with/without bile duct obstruction
NET	Hyperenhancement than pancreas parenchyma on the arterial and/or pancreatic phase
	Discrete margin and lack of adjacent vascular invasion
	Absence or mild degree of pancreatic ductal dilatation
SPT	Strong prevalence among middle-aged women
	Well-defined margin
	Intratumoral high signal intensity on fat suppressed T1W images, suggestive of hemorrhage
	Early, heterogeneous, slowly progressive enhancement pattern
Mass-forming AIP	Hypoenhancing mass like lesion during dynamic phases
	Capsule-like rim enhancement
	Delayed enhancement
	Absence of bile-duct or pancreatic duct stricture
	Irregular or geographic shape rather than round, oval or lobulated shape
Metastasis	Multiple solid pancreatic lesions
	Stronger enhancing masses than pancreas parenchyma if primary malignancy is RCC (evidence of previous nephrectomy or partial nephrectomy)
	Hypoenhancing masses if primary malignancy is not RCC
	Discrete margin

AIP = autoimmune pancreatitis, NET = neuroendocrine tumor, PDAC = pancreatic ductal adenocarcinoma, RCC = renal cell carcinoma, SPT = solid pseudopapillary tumor, T1W = T1-weighted