Pyeloplasty 
   This is a kind of operational surgery in which the obstruction of the ducts between the kidney and ureter is removed. Ureter is a duct that carries urine from kidneys to the bladder. Removing this obstruction prevents any kind of problem and infection.
 


   Signs
   after birth, pain and vomiting are the most frequent symptoms. Besides, hematuria and urinary infection are probable.