Gray scale ultrasonography of a traumatic biliary cyst.

Traumatic hepatic biliary cysts, which occur when there is leakage after traumatic disruption of the biliary system, can be readily detected with hepatic sonography. Differentiation from other hepatic fluid collections can be made by percutaneous thin needle aspiration. Aspiration may have possible utility as a therapeutic modality. A case is presented in which Gray scale ultrasonography revealed a biliary cyst which was drained operatively and resolved.