Cholelithiasis is present. The gallbladder wall is thickened. Within the anterior wall, there is hyperechogenic curvilinear foci causing dirty shadowing, suggestive of intramural gas. This is seen to move with patient positioning. There is pericholecystic fluid. Sonographic Murphy's sign is positive.
The CBD is dilated (maximal diameter 12mm). No choledocholithiasis appreciated. Normal liver echotexture and echogenicity. No focal liver lesion. The portal and hepatic veins are patent. Ascites is present.
Acute emphysematous cholecystitis. Biliary dilatation without identifiable choledocholithiasis.