title: Origination angle of renal artery has no role in renal artery pattern.
abstract: BACKGROUND
  Renal artery (RA) anatomy plays a critical role in selecting donors. During the present study, we sought to evaluate the physiological role of RA origination angle for the presence of an accessory RA or its early branching.
  
  
  METHODS
  During the present cross-sectional study (August 2005-October 2007), 143 candidates for kidney donation underwent RA angiography by 64 multidetector computed tomographic angiography. We assessed the RA diameter, distance to first branching, presence of accessory RA, and early branching, as well as the origination angle of RA from aorta in coronal plane (alpha angle).
  
  
  RESULTS
  The male-to-female ratio was 96:47 with an overall mean age of 27.42 +/- 4.55 years. The alpha angle, sine, cosine of the alpha angle and the deviation factor were not significantly different between kidneys with versus without an accessory artery or between the RA with versus without an early branching. Only the RA diameter (P = .047) and the distance of RA to the branching (P < .001) in kidneys with an accessory RA were significantly lower and higher than those without an accessory RA, respectively. Also the distance of the RA to the branching was significantly less in kidneys with an early branching (P < .001). The RA diameter directly correlated with the RA origination angle (r = .191, P = .001), while there was no correlation between the distance to RA branching and the RA origination angle (r = -.060, P = .311).
  
  
  CONCLUSIONS
  The origination angle of the RA from aorta has no role in the early branching or accessory RA development. There was a direct correlation between the RA diameter and the RA origination angle.
authors.affiliation: Department of Radiology, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: M K
authors.initials: MK
authors.lastname: Tarzamni
authors.forename: N
authors.initials: N
authors.lastname: Nezami
authors.forename: R J
authors.initials: RJ
authors.lastname: Rashid
authors.forename: S
authors.initials: S
authors.lastname: Sagheb
authors.forename: S
authors.initials: S
authors.lastname: Ghorashi
mesh_terms: D000328:Adult; D001012:Aorta, Abdominal / Q000002:abnormalities; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007668:Kidney / Q000000981:diagnostic imaging; D008297:Male; D009392:Nephrectomy / Q000379:methods; D012077:Renal Artery / Q000002:abnormalities / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014019:Tissue Donors / Q000706:statistics & numerical data*; D014057:Tomography, X-Ray Computed; D055815:Young Adult