title: Perihilar branching patterns of renal artery and extrarenal length of arterial branches and tumour-feeding arteries on multidetector CT angiography.
abstract: OBJECTIVE
  The purpose of our study was to assess the extrarenal length of renal arterial branches and tumour-feeding arteries on multidetector CT (MDCT) angiography, in addition to the perihilar branching patterns, with relevance to segmental artery clamping.
  
  
  METHODS
  MDCT angiograms of 64 patients with renal masses <4 cm were retrospectively reviewed by 2 radiologists. The perihilar branching patterns of the single main renal artery were assessed according to the number of pre-segmental and segmental arteries. The extrarenal lengths of segmental plus pre-segmental arteries and the tumour-feeding arteries, measured on volume-rendered images, were compared according to the vascular segmentation and the tumour location, respectively.
  
  
  RESULTS
  In the 116 kidneys, 1 pre-segmental plus 5 segmental arteries (n=48) was the most common branching pattern. The mean extrarenal length of the inferior segmental plus pre-segmental arteries (33.05 mm) and the posterior segmental plus pre-segmental arteries (32.30 mm) was longer than any of the other segmental plus pre-segmental arteries (apical, 23.87 mm; superior, 26.80 mm; middle, 29.23 mm) (p<0.05). The mean extrarenal length of the lower pole tumour-feeding arteries (35.94 mm) was longer than those of the upper and mid-pole tumour-feeding arteries (24.95 mm, 29.62 mm), with significant difference between the lower and the upper pole tumour-feeding arteries (p<0.05).
  
  
  CONCLUSIONS
  Tumours in the lower pole, supplied by the inferior or posterior segmental artery, may be more amenable to segmental artery clamping.
  
  
  CONCLUSIONS
  MDCT angiography with volume rendering can demonstrate the extrarenal length of tumour-feeding arteries and may help in determining the accessibility for segmental artery clamping.
authors: Department of Radiology, Anam Hospital, College of Medicine, Korea University, Seoul, Republic of Korea.
authors: W Y
authors: WY
authors: Kang
authors: D J
authors: DJ
authors: Sung
authors: B J
authors: BJ
authors: Park
authors: M J
authors: MJ
authors: Kim
authors: N Y
authors: NY
authors: Han
authors: S B
authors: SB
authors: Cho
authors: C H
authors: CH
authors: Kang
authors: S H
authors: SH
authors: Kang
mesh_terms: D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D007680:Kidney Neoplasms / Q000098:blood supply* / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D061330:Multidetector Computed Tomography; D059351:Organ Sparing Treatments; D012077:Renal Artery / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D012189:Retrospective Studies