title: An unusual sonographic appearance: the pyramidal gallstone.
authors.affiliation: Department of Radiology, St. Paul's Hospital, Vancouver, British Columbia, Canada.
authors.forename: D T
authors.initials: DT
authors.lastname: Wall
authors.forename: P L
authors.initials: PL
authors.lastname: Cooperberg
authors.forename: J R
authors.initials: JR
authors.lastname: Mathieson
mesh_terms: D000368:Aged; D002765:Cholecystography; D002769:Cholelithiasis / Q000000981:diagnostic imaging*; D005704:Gallbladder / Q000000981:diagnostic imaging*; D006801:Humans; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography