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Steps for insertion of polytetrafluoroethylene membrane-covered self-expandable metallic (UVENTA) stents. (A) Using retrograde pyelography, the length, shape, and level of stricture in the left upper ureter are identified. (B) The obstructed ureter is dilated by using a balloon dilator before UVENTA stent insertion. (C) The UVENTA stent is deployed. Note that 2 stents are sequentially inserted with overlapping ends in order to cover a long stricture.
