What is ureteroscopy surgical tx of lithiasis?

- Principle: retrograde natural introduction of a ureteroscope to visualize and work in contact with the stones. - Extraction of the calculus at the laser ± fragmentation clamp. Risk of ureteral lesions (perforation, stripping). - Indications: o LEC-resistant stone (density> 1000UH), or contraindication of LEC. o In competition with LEC for kidney stones <2 cm. o Stones of the pelvic ureter. - Complications: o hematuria. o Pain of renal colic by ureteral clot. o Urinary infection.