title: The presence of a common channel and associated pancreaticobiliary diseases: a prospective ERCP study.
abstract: BACKGROUND
  There are few endoscopic retrograde cholangiographic studies dealing with the relationship between the presence of a common channel and associated pancreaticobiliary diseases.
  
  
  OBJECTIVE
  To endoscopically determine the incidence of common channels and assess whether the anatomy of the pancreaticobiliary ductal drainage into the duodenum has any bearing on pancreaticobiliary diseases.
  
  
  METHODS
  We prospectively examined a common channel formation in 354 endoscopic retrograde cholangiographic cases. Cases with a common channel were divided into three groups: pancreaticobiliary maljunction, high confluence of pancreaticobiliary ducts with a common channel > or =6 mm in which the communication was occluded with the sphincter contraction, and common channel < or =5 mm in length.
  
  
  RESULTS
  A common channel was observed in 131 cases (37.0%) including 11 with pancreaticobiliary maljunction and 13 with high confluence of pancreaticobiliary ducts. In cases with a common channel, the incidences of associated gallbladder carcinoma and acute pancreatitis were both 11.5%, which were significantly higher than 1.8% and 4.9% seen in cases without a common channel. In pancreaticobiliary maljunction cases, incidence of associated gallbladder carcinoma was 72.7%.
  
  
  CONCLUSIONS
  The presence of an obvious common channel was observed in 37.0%. A close relationship is suggested between the presence of a common channel and development of gallbladder carcinoma and acute pancreatitis.
authors.affiliation: Departments of Internal Medicine and Surgery, Tokyo Metropolitan Komagome Hospital, 3-18-22 Honkomagome, Bunkyo-ku, Tokyo 113-8677, Japan. kamisawa@cick.jp
authors.forename: T
authors.initials: T
authors.lastname: Kamisawa
authors.forename: Y
authors.initials: Y
authors.lastname: Tu
authors.forename: H
authors.initials: H
authors.lastname: Nakajima
authors.forename: N
authors.initials: N
authors.lastname: Egawa
authors.forename: K
authors.initials: K
authors.lastname: Tsuruta
authors.forename: A
authors.initials: A
authors.lastname: Okamoto
mesh_terms: D000208:Acute Disease; D001652:Bile Ducts / Q000002:abnormalities*; D002760:Cholangiopancreatography, Endoscopic Retrograde; D005706:Gallbladder Neoplasms / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D007564:Japan / Q000453:epidemiology; D010182:Pancreatic Diseases / Q000000981:diagnostic imaging* / Q000209:etiology; D010183:Pancreatic Ducts / Q000002:abnormalities* / Q000000981:diagnostic imaging; D010195:Pancreatitis / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology; D011446:Prospective Studies