Computed Tomographic Investigation of the Upper Segmental Renal Artery and its Relation with the Major Calyx among Renal Donors: A Radiological Study and Review

Introduction: Understanding the correlation between the upper segmental renal artery and the collecting system is crucial when approaching the upper pole of the kidney. This study was done to analyze the anatomical variations in the upper segmental artery and its relationship with the major calyx. Materials and Methods: Multidetector computed tomography renal angiogram reports of 99 renal donors who underwent preoperative renal angiograms at a scan center in Chennai, India were included in this study. Results: Upper segmental branch was classified into four types based on their origin. Type 1 was the most common type and was seen in 65.65% on the right side and 50.5% on the left side. Type 2 pattern was seen in 7.07% on the right side and 21.21% on the left side. Type 3 pattern was seen in 14.14% on the right side and 18.18% on the left side. Type 4 pattern was seen in 11.11% on the right side and 8.08% on the left side. Other undefined types were seen in 2.02% on both sides. Conclusion: A thorough understanding of calyceal and intrarenal patterns empowers surgeons to approach renal disorders with precision, minimizing risks and maximizing the chances of successful outcomes in patients.