title: Gas-containing gallstones: their influence on ultrasound images.
abstract: The ultrasound image of gas-containing gallstones was evaluated in three cases. In two, the stones were studied in vitro in a phantom gallbladder by ultrasound, and then by microradiographic techniques. The third case was investigated in vivo by ultrasound and computerized tomography (CT). The presence of gas-containing fissures, which are not detectable on ultrasound, was demonstrated. In contrast, wider fissures, or a true gas bubble, produce reverberation echoes which depend upon the quantity of gas present within the gallstone.
mesh_terms: D002763:Cholecystectomy; D002769:Cholelithiasis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D005740:Gases; D006801:Humans; D008852:Microradiography; D008954:Models, Biological; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography
chemical_list: D005740:Gases