[Surgical treatment of compression of the parapelvic portion of the ureter by the lower polar renal vessels in children].

Suboperative observations of 73 patients have shown that lower polar renal vessels are often associated with other abnormalities (congenital fibrosis and segmentary hypoplasia of the parapelvic portion of the ureter resulting in the development of hydronephrosis, chronic urethritis, atrophy of the muscle layer and secondary stenosis of the ureter). The operation of choice is resection of the pyeloureteral segment and part of the pelvis followed by antevasal anastomosis.