title: Comparison of portal vein anatomy and bony anatomic landmarks.
abstract: OBJECTIVE
  To determine if a relationship exists between the right portal trunk (RPT) and bony structures that might aid guidance of needle passes into the RPT during transjugular intrahepatic portosystemic shunt (TIPS) placement.
  
  
  METHODS
  Sixty-two TIPS portal venograms were reviewed. The distance of the mid-RPT from the lateral margin of the vertebral column was measured and calculated as a fraction of the adjacent vertebral body width. The cephalocaudal height of the RPT was compared with that of the posterior ribs and rib spaces. The cephalocaudal height was evaluated with frequency distribution, and scattergram plots were used to determine the most common location of the mid-RPT relative to bony structures. The height and lateral position were analyzed in relation to clinical parameters to determine the effect of these parameters on RPT position.
  
  
  RESULTS
  The mean distance of the mid-RPT from the lateral vertebral margin was 0.9 vertebral widths (range, 0.1-1.5). Fifty-six of 62 (90%) mid-RPTs were between 0.5 and 1.5 vertebral widths to the right of the lateral margin of the vertebrae. Fifty-four of 62 (87%) mid-RPTs were below the 10th and above the 12th ribs. Clinical factors did not affect RPT position.
  
  
  CONCLUSIONS
  Bony landmarks provide an approximation of the mid-RPT location and may aid in TIPS placement.
authors: Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors: M D
authors: MD
authors: Darcy
authors: K M
authors: KM
authors: Sterling
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007601:Jugular Veins; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D011170:Portasystemic Shunt, Surgical; D011172:Portography / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012272:Ribs / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D013904:Thoracic Vertebrae / Q000033:anatomy & histology* / Q000000981:diagnostic imaging