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. 2023 Sep 15;11(9):E859–E865. doi: 10.1055/a-2125-3896

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 5 — Problems in UMIDAS. a Stent migration into the common bile duct. Arrow shows the position of the Vater papilla. b Renewal stent of UMIDAS for preventing migration (arrowhead: bigger duodenal side flap). A patient showed a change in the bile duct form (image resembling cholangiocarcinoma). c, d Stenosis of the bile duct located at the central flap of UMIDAS and e bile duct wall thickness.