A distal uretal calculus is a kidney stone that has either moved to or developed just above the bladder in one of the tubes that brings urine down from the kidneys. This is a dangerous situation because the stone is hard a jagged and if it cuts through the tube, called the ureter, it can be potentially fatal.
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There is a stone at the end of your ureter, the tube from your kidney draining urine into the bladder and the ureter is dilated around the stone.