Features of surgical treatment of obstruction of the pyeloureteral segment of the lower half of the doubled kidney against the background of incomplete doubling of the upper urinary tract

Introduction. The combination duplication of upper urinary tract with ureteropelvic junction obstruction (UPJO) is a rather rare anomaly with a frequency of 2-7% among all UPJO. The rather low frequency of occurrence of UPJO in the duplex kidney and the variability of its anatomical variants determine the absence of standardized approaches to the choice of the method of plastic intervention. Materials and methods. The article presents the results of surgical treatment of 26 children with UPJO in the lower pole of a duplex kidney over the past 20 years in 7 clinics of the Russian Federation and the Republic of Belarus. Children are divided into 3 groups depending on the type of surgical technique. Group 1 – dismembered pyeloplasty of the lower pole with the formation of an end-to-end anastomosis between the pelvis and the ureter of the lower pole. Group 2 – ureteropyeloanastomosis side-to-side between the ureter of the upper pole and the pelvis of the lower pole. Group 3 – dismembered pyeloplasty of the lower pole end-to-end with a common ureter with simultaneous formation of a submerged ureteropyeloanastomosis end-to-side between the ureter of the upper pole and the pelvis of the lower pole. Results. Postoperative complications of varying severity according to Clavien-Dindo were observed in 4 (15.4%) children. 3 (11.5%) patients required repeated pyeloplasty. The immersive anastomosis in group 3 patients functioned satisfactorily in all cases. Conclusion. The experience of surgical treatment of UPJO in the lower pole of the duplex kidney demonstrates a higher recurrence rate compared to standard pyeloplasty. The variability of the anatomical features of the UPJO of the lower pole of the duplex kidney determines the need for a personalized approach to the choice of the UPJO reconstruction technique.