Table 1 Comparison of imaging findings between the present case and typical cases of SCA solid type and well-differentiated PNEN

Macroscopic appearance

Solid tumor

Well-circumscribed

Solid tumor [17]

Solid tumor [15]

Well-circumscribed [15, 17]

Contrasted CT

 Arterial phase

Solid pattern

Enhanced

Solid pattern [13]

Enhanced [17]

Solid pattern [17]

Enhanced [15]

 Portal phase

Isoconcentration

Tend to be washed out [14]

Tend to be enhanced [15]

MRI

 T1WI

Low

Low [10]

Low [10, 15, 16]

 T2WI

High

High [10]

High [10, 15, 16]

 DWI

High

High [17]

High [17]

 ADC

Slightly high

High [17, 18]

Low (depending on the degree of malignancy) [17, 18]

EUS

Hyperechoic mass

Hyperechoic mass [20], PEE [19]

Hypoechoic mass [19]