A 13-year-old boy surnamed Zhan experienced mild lower back pain and went to the hospital for a check-up. It was discovered that his left ureter was narrowed, causing long-term difficulty in urination, which led to left kidney stones and hydronephrosis. After surgery to remove the narrowed section, his symptoms improved. (Reported by Zhang Wenlu)

Dr. Chen Xianglai, a urologist at Tong General Hospital, explained that "ureteral stricture" is caused by congenital embryonic developmental defects and is difficult to detect. This 13-year-old boy did not exhibit obvious symptoms initially and only sought medical attention after experiencing back pain. An ultrasound revealed hydronephrosis combined with kidney stones. Further CT scans indicated "narrowing of the upper left ureter" with a twisted ureter. The narrowed section of the ureter was surgically removed and reconnected, resolving the patient's back pain. The doctor noted that poor urine flow can easily lead to stones, urinary tract infections, or blockages causing hydronephrosis. Patients may experience back pain, hematuria, and even worsened pain after drinking water. The doctor pointed out that ureteral stricture is more common in males, with the left kidney being more susceptible. The chance of both sides being affected simultaneously is about 10%. The doctor advised that patients experiencing difficulty urinating should seek medical attention promptly to prevent continuous kidney enlargement and damage, which could eventually lead to the need for dialysis.

Source: http://tw. news. yahoo. com/ article/ url/ d/ a/ 060912/ 1/ 3lio. html