The pattern of peri-hilar and hilar arterial branching in kidney allografts of living donors

Introduction: Kidney transplantation gives us the opportunity to study kidney vascular anatomical variations and their probable effect on allograft survival. Objectives: The aim of this study was to evaluate the renal arteries’ branching patterns of the engrafted kidneys and their impact on transplant outcomes. Patients and Methods: Three hundred patients who received kidney transplantation between 2014 -2017 were included. Peri-hilar and hilar branching patterns of the engrafted kidney were studied by reviewing the archived CT angiographies of donors and then they categorized based on the existing knowledge in this field. Clinical data were also gathered from medical records and recipients’ latest clinical and laboratory evaluations. Results: Based on peri-hilar and their corresponding hilar branching patterns, our morphology findings were classified into 17 groups. From different peri-hilar branching patterns, the fork pattern was more common which is detected in 95% (242) while the ladder pattern was observed in 5% (13) of kidney grafts. In a later branching sub-categorization, among the fork pattern, 65.2% (158) were duplicated and 34.7% (84) had triplicated hilar branching patterns. There was not a statistically significant correlation between each of those patterns and allograft function ( P > 0.05). Conclusion: Peri-hilar and hilar branching patterns of the kidney allografts’ renal artery were different, but they follow certain patterns. Although it may not influence the allograft survival, it provides us precise knowledge about renal vasculature patterns and outcome of probable vascular events meanwhile; it could be useful in the field of transplantation.