title: Variations in internal iliac veins detected using multidetector computed tomography.
abstract: BACKGROUND
  Anatomical variations of the internal iliac veins (IIV), which have the potential to cause problems during related surgery, are not uncommon and are not fully appreciated.
  
  
  OBJECTIVE
  To determine the types and prevalence rates of anatomical variations of the IIV using multidetector computed tomography (MDCT).
  
  
  METHODS
  IIV variations in 63 patients who underwent contrast-enhanced MDCT were interpreted and classified by two radiologists retrospectively. The prevalence rates (with 95% confidence intervals [CIs]) were calculated.
  
  
  RESULTS
  IIV variations were classified into six types: normal (n=45, 69.8%; 95% CI 59–81%); left IIV connecting with the left external iliac veins centrally (n=5, 7.9%; 95% CI 1–15%); separated trunk of the left IIV draining into the central left common iliac veins(CIV; n=3, 4.8%; 95% CI 0–10%); right IIV draining into the central left CIV (n=7,11.1%; 95% CI 3–19%); right IIV draining into the central right CIV (n=1, 1.6%; 95% CI 0–5%); and the bilateral IIVs connecting with each other before draining into the central left CIV (n=3, 4.8%; 95% CI 0–10%).
  
  
  CONCLUSIONS
  MDCT demonstrates six types of IIV variations; the prevalence rate of IIV anomalies is not low.
authors.affiliation: Department of Radiology, Saiseikai Kurihashi Hospital, Kouemon, Kurihashi-Machi, Kitakatsushika-Gun, Saitama, Japan. i@imodey.com
authors.forename: S
authors.initials: S
authors.lastname: Morita
authors.forename: N
authors.initials: N
authors.lastname: Saito
authors.forename: N
authors.initials: N
authors.lastname: Mitsuhashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000013:Congenital Abnormalities / Q000453:epidemiology; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D006801:Humans; D007084:Iliac Vein / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: D003287:Contrast Media