The anatomy of the renal lower calyceal group influence on the risk of residual stones in the Urolithiasis treatment

Abstract

Background. There are various data in the literature regarding the boundary values of the width and length of the neck, as well as the angle between the pelvis and infundibulum. These parameters distinguish between patients with high and low risk of residual fragments.Objectives. The purpose of this study is to examine the lower calyceal group anatomy of patients without kidney stones and to compare the obtained results with previously published one. Materials and methods. Retrospective stage: Computed tomography (CT) scan of the abdomen was obtained in 120 patients (which was performed on them from March 2018 to 2019). CT scans of 100 patients (200 kidneys) were included in analysis after exclusion of inappropriate data. The infundibulopelvic angle was measured using the two most common methods by Sampaio and by Elbahnasy. Also, the length and width of the lower infundibulum were measured. All results were divided into four groups depending on the Sampaio classification of pyelocaliceal system (PCS). Results. The average value of the infundibulopelvic angle according to the Elbahnasy’s method is 74.1±15.1, and according to the Sampaio method is 101.8±20.1. When measured by the Elbahnasy method, an angle of more than 90 ° is more likely to occur with A1 structure variant, and less than 90 ° is more likely to occur in the PCS corresponding to the A2 variant. The average length of the lower infundibulum is 20.7±2.8 mm. The higher value of the lower infundibulum width was in group A1. Conclusion. In our study, all parameters were out of risk of both the low success of the operation and the development of kidney stone indicated in previously published studies. This fact can confirm the influence of the anatomy of the lower calyceal group on the development of kidney stones.