Table 1: Comparison of simple cyst, and complicated cyst and biliary cystadenocarcinoma.

USCTMRI

Simple cystMonolocular
Anechoic lesion with increased through transmission of sound
No structure
Uniformly water-density
Smooth thin walls
No structure
No enhancement
T1WI: homogeneously hypointensity
T2WI: homogeneously hyperintensity
No structure
No enhancement

Complicated cystHoneycomb pattern
Increased echo levels of cystic fluid
Mural nodularity
Various thickness of the walls
Unclear boundary
Usually no enhancement
T1WI: various intensity
T2WI: hyperintense
Septal and/or nodular structures
Usually no enhancement

Biliary
cystadenocarcinoma
Multilocular
Septal and/or Nodular structures
Uneven for every locular
Thick fibrous capsule
Solid tumor component
Increased contrast uptake
T1WI, T2WI: various intensity
Septal and/or nodular structures
Increased contrast uptake

T1WI: T1-weighted imaging,T2WI: T2-weighted imaging.