Pelvi-Ureteric Junction Obstruction (PUJO) in children is a condition in which there is a blockage at the point where the kidney joins the ureter. The ureter is the tube that carries urine from the kidney to the bladder.
In children with PUJO, urine cannot drain properly from the kidney because of narrowing or obstruction at this junction. As a result, urine collects inside the kidney, causing swelling of the kidney, known as hydronephrosis.
PUJO in children is one of the most common causes of hydronephrosis in infants and children. The condition may affect one kidney or, in rare cases, both kidneys. Many cases are detected during a pregnancy ultrasound, while others are diagnosed later when symptoms develop.
Early diagnosis and proper treatment of Pelvi-Ureteric Junction Obstruction in children are important to protect kidney function and prevent long-term complications.
Some children with PUJO may not show symptoms in mild cases. Symptoms usually appear when the urine blockage becomes significant.
Common symptoms of PUJO in children include:
In severe cases, kidney function may gradually become affected.
PUJO in children usually develops due to abnormal formation of the urinary tract before birth.
Common causes include:
Most cases of Pelvi-Ureteric Junction Obstruction in children are congenital, meaning the child is born with the condition.
This is the most common type and is present from birth due to abnormal urinary tract development.
This type develops later due to infection, inflammation, injury, or kidney stones.
The blockage occurs within the wall of the pelvi-ureteric junction because of narrowing or abnormal muscle formation.
The obstruction occurs because an external structure, such as an abnormal blood vessel, compresses the ureter from outside.
Certain factors may increase the risk of PUJO in children.
Risk factors include:
PUJO is more commonly seen in boys than in girls.
If untreated, PUJO in children may lead to serious complications.
Urine buildup causes swelling of the kidney.
Poor urine drainage increases the risk of infections.
Long-term obstruction may damage kidney tissue.
Severe blockage may affect the kidney’s ability to function properly.
Stagnant urine can increase the risk of stone formation.
Kidney damage may contribute to hypertension later in life.
Doctors use several tests to diagnose PUJO and evaluate kidney function.
Diagnosis may include:
A renal scan helps determine the severity of obstruction and kidney function.
Treatment depends on the severity of the blockage and kidney function.
Mild PUJO in children may improve naturally and only require regular monitoring with ultrasounds.
Children with repeated urinary infections may require antibiotics.
Severe obstruction or worsening kidney function usually requires surgery.
Pyeloplasty is the most common surgery for Pelvi-Ureteric Junction Obstruction in children.
During this procedure:
Pyeloplasty has a very high success rate in children.
Some children may undergo laparoscopic or robotic pyeloplasty for smaller scars and faster recovery.
Most children recover well after pyeloplasty surgery.
Parents are usually advised to:
Most children return to normal activities within a few weeks.
Helpful care measures include:
Early treatment helps protect long-term kidney health.
Parents should consult a pediatric urologist if the child develops:
Early diagnosis of Pelvi-Ureteric Junction Obstruction in children helps prevent kidney damage.
Yes, PUJO is one of the common causes of kidney swelling in infants and children.
Some mild cases may improve as the child grows.
No, only severe cases or those affecting kidney function usually require surgery.
Pyeloplasty is a surgery that removes the blockage and restores normal urine drainage.
Yes, severe, untreated obstruction may gradually damage kidney function.
Yes, pyeloplasty is a commonly performed and highly successful surgery in children.
Dr. Muni Varma is an experienced Pediatric Surgeon and Pediatric Urologist offering advanced diagnosis and treatment for Pelvi-Ureteric Junction Obstruction (PUJO) in children. With expertise in managing hydronephrosis, congenital urinary tract abnormalities, and pediatric kidney disorders, Dr. Varma provides child-focused care using modern diagnostic and surgical techniques. From careful monitoring of mild cases to advanced pyeloplasty and minimally invasive surgery, he focuses on protecting kidney function, improving urine drainage, and preventing long-term complications. Early expert treatment and regular follow-up help children maintain healthy kidney development and overall well-being.
