title: Paraumbilical collateral veins on MRI as possible protection against portal venous thrombosis in candidates for liver transplantation.
abstract: BACKGROUND
  We retrospectively evaluate the potential protective influence of patent paraumblical vein (PUV) collaterals against portal vein (PV) thrombosis and reduced PV diameter in candidates for orthotopic liver transplant (OLT) METHODS: Dynamic 3D contrast-enhanced MRI at 1.5T was obtained in 309 patients with cirrhosis without evidence of malignancy. All MR studies were reviewed by one reader for PUV collaterals, PV thrombosis and PV diameter. Statistical analysis was performed by Fisher exact tests; 50 selected studies were reviewed independently by two additional readers to determine interobserver agreement via intraclass correlation coefficient (ICC).
  
  
  RESULTS
  Patent PUV was noted in 119 of 309 patients (38.5%). Mean PV diameter was 13.4 +/- 3.0 mm in patients with PUV compared with 11.3 +/- 3.6 mm without PUV (P < 0.01). Main PV thrombosis was present in 13 of 309 patients (4.2%) and significantly more frequent in those without PUV than with PUV (6.3% vs. 0.8%, P < 0.05). ICC indicated almost perfect agreement among three readers for presence of PUV collaterals (ICC = 0.91) and PV thrombosis (ICC = 0.96).
  
  
  CONCLUSIONS
  Our results suggest that patients with patent PUV appear less likely to develop main PV thrombosis or small PV diameter, suggesting a protective effect of PUV on PV patency.
authors.affiliation: Department of Radiology, Thomas Jefferson University Hospital, 132 South 10th St 1094 Main Building, Philadelphia, PA 19107, USA.
authors.forename: Sachit K
authors.initials: SK
authors.lastname: Verma
authors.forename: Donald G
authors.initials: DG
authors.lastname: Mitchell
authors.forename: Yulia
authors.initials: Y
authors.lastname: Lakhman
authors.forename: Diane
authors.initials: D
authors.lastname: Bergin
authors.forename: Ronald J
authors.initials: RJ
authors.lastname: Dolin
authors.forename: Cataldo
authors.initials: C
authors.lastname: Doria
authors.forename: Laurence
authors.initials: L
authors.lastname: Parker
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003097:Collateral Circulation; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D019786:Gadolinium DTPA / Q000008:administration & dosage; D006801:Humans; D021621:Imaging, Three-Dimensional; D008103:Liver Cirrhosis / Q000473:pathology* / Q000601:surgery; D016031:Liver Transplantation; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000473:pathology*; D012189:Retrospective Studies; D014472:Umbilicus / Q000098:blood supply*; D020246:Venous Thrombosis / Q000175:diagnosis*
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA