Blood clots can prevent urine outflow through either ureter or the bladder. The renal pelvis functions as a funnel for urine flowing to the ureter. Compression of the ureter may lead to hydronephrosis. The donor ureter is anastomosed with the recipient bladder. This can be between the vagina and rectum, ureter, or bladder. Blockage, or obstruction of the ureter can occur. Congenital disorders of the ureter and urinary tract affect 10% of infants. He had a single normal bladder and ureter. Lymphatic drainage depends on the position of lymphatic vessels in the ureter. They are designed to allow urine to flow past an obstruction in the ureter. This fissure is a hilum that transmits the vessels, nerves, and ureter. Robot-assisted surgery of the prostate, kidney, and ureter has been expanding this field. The additional ureter may result in a ureterocele, or an ectopic ureter. BMP4 secretion helps cause differentiation of the ureteric bud into the ureter. The procedure entails removing the segment of cancerous ureter and reattaching the end.