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Updated: Aug 10, 2026

Assessing Urinary Tract Junction Obstruction Defects by Methylene Blue Dye Injection
Published on: October 12, 2017
The role of endourology in ureteropelvic junction obstruction
P J Van Cangh1, S Nesa, B Tombal
1Department of Urology, Catholic University of Louvain Medical School, Cliniques Universitaires St. Luc, 10 Avenue Hippocrate, B-1200 Brussels, Belgium. vancangh@chex.ucl.ac.be
Abstract:
Endopyelotomy has benefited from abundant confirmatory investigations, and significant progress in different technical modalities has occurred. Retrograde techniques, including the Acucise (Applied Medical, Laguna Hills, CA) cutting balloon and the ureteroscopic Holmium laser incision, are becoming preferred approaches while the other modalities retain their specific indications. Long-term results and potential complications have been carefully studied and reported. Better identification of risk factors has prompted precise preoperative investigations and allowed for careful patient selection, leading to improved results. These results approach those of open pyeloplasty, but with minimal morbidity.
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