title: A novel approach for differentiating etiology of gallstone formation: sistocholedochal angle.
abstract: OBJECTIVE
  Many etiological factors such as glad bladder motility disorders, chemical component of bile and chemical content of bile have been accepted on gallstone formation; but anatomic variations of bile duct has been never discussed before. The aim of this study was to assess whether the anatomical measurements of cystic canal length, common bile duct length, choledoc length and the angle between the cystic duct and common bile duct junction (sistocholedochal angle: SCA) affects the gallstone formation.
  
  
  METHODS
  MRI data of patients who had undergone magnetic resonance cholecysto pancreatography (MRCP) due to any reason, were collected retrospectively. A total of 126 patients was divided into two groups as without (group I; n=38) and with (group II; n=88) gallstone formation. The cystic canal, choledoc and common bile duct length and SCA measurements were obtained.
  
  
  RESULTS
  There was no significant difference between two groups on the means of cystic canal, choledoc and common bile duct lengths (p > 0.05) but SCA measurements were significantly higher in group II compared with group I, statistically (p < 0.05); showing that as the SCA increases, the incidence of gallstone formation increases.
  
  
  CONCLUSIONS
  Higher SCA values can be indictable on gallstone formation.
authors: Department of General Surgey, Bozok University, School of Medicine, Yozgat, Turkey. drerkoc@gmail.com.
authors: M
authors: M
authors: Sipahi
authors: M F
authors: MF
authors: Erkoç
authors: H I
authors: HI
authors: Serin
authors: H
authors: H
authors: Börekçi
authors: O
authors: O
authors: Banlı
mesh_terms: D000328:Adult; D000368:Aged; D001652:Bile Ducts / Q000000981:diagnostic imaging* / Q000601:surgery; D002763:Cholecystectomy; D002769:Cholelithiasis / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000601:surgery; D003549:Cystic Duct / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D042882:Gallstones / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014463:Ultrasonography