<prompt> Ureteral tumor occurs most frequently in-Upper 13 of ureterMiddle 13 of ureterLower 13 of ureterEqually along the length of ureter  <response>: Cancer of the ureter ureteral cancer is a type of cancer that begins in the cells that line the inside of the tubes ureters that connect your kidneys to your bladder. Ureters are pa of the urinary tract, and they carry urine produced by the kidneys to the bladder. Ureteral cancer is uncommon 