Anatomical differences in the right and left renal arterial patterns.

The aim of this study was to determine the pattern and character of the renal arteries in patients referred for preoperative or diagnostic evaluation of the renal or abdominal arteries by multi-detector computed tomography and, by comparing the arterial anatomy of the right and left kidneys, to evaluate the effect of differences in their anatomical position on the characteristics of the arteries. During a cross-sectional study from August 2005 to October 2007, 117 patients underwent contrast-enhanced 64-slice multi-detector computed tomography renal angiography in Tabriz Imam Khomeini Hospital (Parsian Centre). The number of arteries, the number of branches and the presence of accessory arteries and early branching were assessed in the renal arteries on both sides. In all, the data for 117 patients data were analysed, 76 (65%) of whom were male and 41 (35%) female. The mean of age of the patients was 39.26 +/- +/- 17.03 years. The mean diameters of the aorta and renal artery were 2.62 +/- +/- 1.55 mm and 0.62 +/- 0.11 mm respectively and the distance to branching was 3.39 +/- 1.59 mm. There was no significant difference in diameter between the left and right renal arteries or in the distance to branching (0.62 +/- 0.11 vs. 0.61 +/- 0.12 mm; p = 0.35; 3.24 +/- 1.2 vs. 3.56 +/- 1.77 mm; p = 0.11). An accessory artery was presented in 58 kidneys and this significantly more often occurred on the right side than on the left side: 38 of 117 (32.47%) right kidneys vs. 20 of 117 (17.09%) left kidneys (p = 0.01). There was early branching in 42 subjects (35.89%). In a comparison of early branching of the arteries of the right and left kidneys, no significant difference was found, despite the higher incidence of branching on the right side. The diameters of the right and left renal arteries and the distances to branching did not differ. Apart from width, there was no difference in kidney size. An accessory artery occurred more frequently in the right renal artery than in the left.