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Ureteropelvic Junction Obstructions

​Ureteropelvic junction (UPJ) obstruction is a blockage at the point where part of the kidney attaches to one of the tubes to the bladder (ureters). This blocks the flow of urine out of the kidney.
UPJ obstruction mostly occurs in children. It often happens when a baby is still growing in the womb. This is called a congenital condition (present from birth). The blockage is caused when there is a narrowing of area between the ureter and the part of the kidney called the renal pelvis. Urine can build up and damage the kidney as a result.
The condition can also be an abnormal blood vessel over the ureter. In older children and adults, the problem may be due to scar tissue, infection, earlier treatments for a blockage, or kidney stones.
UPJ obstruction is the cause of most urinary obstructions in children. It is now commonly detected before birth with ultrasound tests. In some cases, the condition may not show up until after birth. Symptoms may include an abdominal mass or a urinary tract infection.
Surgery may be needed early in life if the problem is severe. Most of the time, surgery is not needed until later. Some cases do not require surgery at all.