Boari-Flap reconstrution due to a total ureteral avulsion in a patient with ipslateral ureterolithiasis and contralateral renal nodule.

The ureteral avulsion during ureterolithotripsy (URS) occurs due to the sudden movement of the optical device or endoscopic extractor either in its removal or insertion, associated with a probable previous lesion in the ureter wall, causing a vital fragility area. A 52-year-old male patient with, an obstructive calculus of 9 mm was found in the left middle ureter, and a heterogeneous hypervascular nodule located in the right kidney, suggesting neoplasia. During procedure with rigid ureteroscopy with ureteroscope removal, due to the pressure of the device and tissue fragility, there was total ureter avulsion.