Fig. 17.
Standard longitudinal ultrasonography scans of the extrahepatic biliary tract (a–c) show a dilated common bile duct (b, calliper) obstructed by a hyperechoic gallstone (c, calliper) with acoustic shadow cone (c, arrow)
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.