title: Floating stones in a nonopacified gallbladder: ultrasonographic sign of gas-containing gallstones.
abstract: Floating stones were noted in the nonopacified gallbladder at ultrasound examination. Gas-containing fissures in these stones could be demonstrated pre- and postoperatively (Mercedes Benz sign).
mesh_terms: D000328:Adult; D002769:Cholelithiasis / Q000175:diagnosis*; D005740:Gases; D006801:Humans; D008297:Male; D014463:Ultrasonography
chemical_list: D005740:Gases