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The use of flexible ureteroscopes combined with holmium laser also offers minimally-invasive solutions in the management of cases with stones associated with intrarenal obstruction, such as pyelocaliceal diverticulum or infundibular stenosis.[7] UUTC constitute approximately 5�C6% of all urothelial malignancies. Ureteral tumors represent approximately 25% of UUTC. They are found in the distal ureter in 70% of cases, and in the middle ureter in 25% of cases, whereas the remaining 5% are discovered in the proximal ureter. Bilateral disease appears in 2�C4% of cases, whereas a bladder lesion develops in 30�C75% of patients.[8] According to the EAU Guidelines, the indications for conservative surgery are represented by all imperative cases (renal insufficiency, solitary kidney, bilateral tumors, severe comorbidities) or, eventually, in low-risk https://en.wikipedia.org/wiki/Crotamiton patients (low-grade ureteroscopic biopsy, low-grade cytology, http://www.selleckchem.com/products/rxdx-106-cep-40783.html tumor size http://www.selleckchem.com/products/CP-673451.html but also when an associated pathology (e.g. pyuria) imposes such a manoeuvre and repeating the attempt during another session. Cetti et?al. reported an incidence of pre-ureteroscopy double-J stenting of 8% after failed ureteroscopic approach and ureteral dilation. They associated this with difficult ureters as a result of anatomical abnormalities, a narrow ureteric lumen, tortuous ureteric path or previous instrumentation.[13] In pediatric patients, some authors routinely place an indwelling double-J stent,[14] whereas others consider that this type of approach is solely necessary when primary flexible ureteroscopic insertion is unsuccessful. Corcoran et?al.