Fig. 1

(from top left to bottom) A: longitudinal gallbladder view with the “champagne sign” and pericholecystic fluid. B: Transverse gallbladder view with further evidence of the champagne sign. A gallbladder neck gallstone is present, with evidence of acoustic shadowing. C: longitudinal with evidence of champagne sign and pericholecystic fluid (Yellow = gas, Orange = pericholecystic fluid, green = gallstone).