title: Ultrasonic characteristics of tumefactive biliary sludge: a thixotropic phenomenon.
mesh_terms: D000368:Aged; D001646:Bile / Q000032:analysis / Q000502:physiology*; D002763:Cholecystectomy; D002769:Cholelithiasis / Q000175:diagnosis; D002784:Cholesterol / Q000032:analysis; D003102:Colloids; D003937:Diagnosis, Differential; D005260:Female; D005705:Gallbladder Diseases / Q000175:diagnosis*; D005706:Gallbladder Neoplasms / Q000175:diagnosis; D006801:Humans; D008875:Middle Aged; D014463:Ultrasonography
chemical_list: D003102:Colloids; D002784:Cholesterol