The ureter which runs behind the main lower vein is the evolutionary fault of the vascular system. It is the result of the disorder of the foetal vein canals developments. The clinical symptoms resulting from this fault are: the pains in the lumbar region, hematuria, the recurrent pyelonephritis, nephrolithiasis and the arterial hypertension. Ultrasonography, tomography and magnetic resonans imaging are used in the diagnosis. The best treatment is the operation leading to the restoration of the ureter anatomic position. Nowadays the laparoscopic minimal invasive methods are used more and more often. In this study we described 3 patients. Each of them underwent the operation to correct the ureter position. The result was the improvement of the clinical condition.