Peculiarities of the morphology of the renal pelvic in external and internal obstruction of the pyeloureteral segment in children

Introduction. Pathophysiology behind the formation of pelviureteric junction obstruction (PUJO) combined with a crossing lower polar vessel remains the subject of discussion. The main discussed issue is the role of external compression in the formation of consequential structural changes in the ureteropelvic segment and their significance for the development of PUJO. The research interest is determined by the practical aspect associated with the possibility and expediency of transposition of the conflicting vessel as an alternative to pyeloplasty with the formation of an antevasal anastomosis. In this study, we compared the specifics of pelvic morphology in PUJO cases considering the background intrinsic and extrinsic factors. Material and methods. The paper offers the results of morphological analysis of the pelvis in 14 children with PUJO combined with background internal and external factors. The patients were subdivided into 2 groups based on the PUJO causes. Group 1 - 4 patients with a vascular-ureteral conflict, group 2 - 10 patients with intrinsic PUJO causes. All patients underwent dismembered pyeloplasty without pelvic reduction. A 5 mm pelvic flap was cut off intraoperatively above the PUJ area and sent for histological examination.