title: Is age associated with size of adult extrahepatic bile duct: sonographic study.
abstract: OBJECTIVE
  To determine if the size of the extrahepatic bile duct increases with age in adults.
  
  
  METHODS
  A total of 258 consecutive patients 18 years and older, without known biliary or pancreatic disease, who were fasting to undergo routine abdominal sonography were examined. The transverse and anteroposterior dimensions of the extrahepatic bile duct were measured proximally at the porta hepatis, at the middle above the head of the pancreas, and distally at the head of the pancreas. Simple linear regression of the average of these measurements against age tested the hypothesis of a slope of 1.0 mm per decade.
  
  
  RESULTS
  The sample included a wide variety of ages: 55 years +/- 16 (mean +/- SD), with a range of 20-92 years, including 151 men and 107 women. One-tenth of the cohort were younger than 35 years old and one-tenth were older than 77 years old. The six measurements were proximal-transverse 3.5 mm +/- 1.0, proximal-anteroposterior 2.9 mm +/- 1.1, middle-transverse 3.9 mm +/- 1.2, middle-anteroposterior 3.4 mm +/- 1.2, distal-transverse 4.1 mm +/- 1.2, distal-anteroposterior 3.5 mm +/- 1.2. Least squares regression slope differed significantly from 0.1 mm per year (95% CI; -0.000703, +0.00110) and in fact contained zero.
  
  
  CONCLUSIONS
  Findings were not able to help confirm an association between age and size of the extrahepatic bile duct in an asymptomatic adult population.
authors.affiliation: Department of Radiology, Albert Einstein Medical Center, 5501 Old York Rd, Philadelphia, PA 19141-3098, USA. horrowm@einstein.edu
authors.forename: M M
authors.initials: MM
authors.lastname: Horrow
authors.forename: J C
authors.initials: JC
authors.lastname: Horrow
authors.forename: A
authors.initials: A
authors.lastname: Niakosari
authors.forename: C L
authors.initials: CL
authors.lastname: Kirby
authors.forename: H K
authors.initials: HK
authors.lastname: Rosenberg
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D017734:Bile Ducts, Extrahepatic / Q000000981:diagnostic imaging* / Q000254:growth & development*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography