[Reflective anuria secondary to unilateral lithiasis].

Reflex anuria is a rare phenomenon characterized by the cessation of urine production from both kidneys, triggered by a painful stimulus or trauma to the urinary tract (kidney-ureter), in the absence of other explanatory events such as sepsis, shock or hypovolemia. A case of prolonged anuria and acute renal failure in a 21-year-old male with a history of lower back pain triggered by unilateral ureteral obstruction (stone) is presented. A contralateral renoureteral obstructive component has been ruled out. This led to the need for renal replacement therapy with hemodialysis and the placement of a double "J" ureteral stent. A few hours after treatment, recovery of urinary output and improvement in glomerular filtration rate were observed, making this one of the few cases reported with these characteristics.