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. 2022 Jan 24;22:7. doi: 10.1186/s12894-022-00960-6

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Surgical procedures of ultrasound-guided flexible ureteroscopy. A The operator approached the wall of the suspected cyst under a flexible ureteroscopic view and palpated the mucosa in this area. B Assistants applied ultrasound to monitor ureteral flexible scopes for contact and compression of the cyst (the arrow points to the cyst, and the rounded area is the end of the flexible ureteroscope). C The operator used a laser to cut in the area where the cyst was identified. D Assistants used ultrasound to monitor the incision of a parapelvic cyst (the circular area has a smoky appearance on the ultrasound image when the laser was working.)