title: Prevalence of renal vascular variations: Evaluation with MDCT angiography.
abstract: OBJECTIVE
  The purpose of this retrospective study was to investigate the prevalence of renal artery (RA) and renal vein (RV) variations, the distribution of these variations with respect to gender and the types of RA and RV variations on multi-detector computed tomographic (MDCT) angiography.
  
  
  METHODS
  The MDCT angiography examinations of 504 patients (317 men, 187 women) with a mean age of 56.4 years±11.7 (SD) (range: 18-92 years) were retrospectively reviewed to determine the number and branching pattern of the RAs and the number and variations of the RVs (retroaortic or circumaortic left RV, late venous confluence).
  
  
  RESULTS
  The prevalence of multiple RAs was 31.3% (22.2% for two RAs, 7.5% for three RAs, 1.4% for four RAs, 0.2% for five RAs) and prehilar branching was 6.5%. The prevalence of multiple right RVs was 21.6% (19.2% for two RVs, 2.2% for three RVs and, 0.2% for four RVs). The prevalence of circumaortic left RV was 5.2%, retroaortic left RV was 4.2% and, late venous confluence was 7.3%. No associations were found between gender and presence of RA or RV variations (P=0.630 and 0.650, respectively).
  
  
  CONCLUSIONS
  Accessory RAs are frequently observed. Multiple right RVs is the most common RV variation. No associations are found between gender and RA or RV variations.
authors.affiliation: Department of Radiology, Türkiye Yüksek İhtisas Hospital, Kızılay street, No. 4, 06100 Sıhhiye, Ankara, Turkey.
authors.forename: C
authors.initials: C
authors.lastname: Çınar
authors.affiliation: Department of Radiology, İstanbul Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital, İstanbul street, No. 11, Küçükçekmece/İstanbul, Turkey. Electronic address: aturkvatan@yahoo.com.
authors.forename: A
authors.initials: A
authors.lastname: Türkvatan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000072226:Computed Tomography Angiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D015995:Prevalence; D012077:Renal Artery / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D012082:Renal Veins / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D012189:Retrospective Studies; D055815:Young Adult
keywords: Multi-detector computed tomography; Prevalence; Renal artery; Renal vein; Variation