ultrasound examination To further delineate the underlying problem an ultrasound examination was performed which demonstrated a fluid collection in the gallbladder fossa and a dilation of the intra-and extrahepatic biliary treeultrasound examination To further delineate the underlying problem an ultrasound examination was performed • which demonstrated a fluid collection in the gallbladder fossa • and a dilation of the intra- and extrahepatic biliary tree