Biliary cystadenoma and cystadenocarcinoma echocardiography or ultrasound

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Ultrasound

There are no specific imaging features that permit reliable differentiation of biliary cystadenoma from cystadenocarcinoma.

• At US, a biliary cystadenoma appears as a unilocular or multilocular cyst with enhanced through transmission.
• Acoustic shadowing may be present from septal or wall calcification.
• The cyst fluid may contain low-level echoes from blood products, mucin, or proteinaceous fluid. Serous and bilious cyst fluid is generally anechoic.
• Echogenic mural nodules and papillary projections may be present.

At US, a biliary cystadenoma appears as a unilocular or multilocular cyst with enhanced through transmission. The content of the cysts may range from completely anechoic to having low-level echoes from blood products, mucin, or proteinaceous fluid.

Mural nodules and papillary projections may project into the cyst lumen. If septal or wall calcification is present then acoustic shadowing may be seen.