Complication
petechiae, muscle injury
PETECHIAE, EROSION, COMPLICATIONS
After the completion of the surgery, another surgeon other than the operator performed a diagnostic ureteroscopy and visual record for evaluation and grading of the ureteral wall injury based on a previously established five-grade classification system. Grade 0 indicated no lesion or only mucosal petechiae, grade 1 represented mucosal erosion or a mucosal flap without smooth muscle injury, grade 2 involved both the mucosa and smooth muscle while sparing the adventitia, grade 3 denoted ureteral perforation encompassing the full thickness of the ureteral wall, including the adventitia, and grade 4 indicated complete ureteral avulsion. The procedure-related complications were assessed and categorized using the Clavien–Dindo classification system [