PUJO & PUV in Children: Silent Causes of Kidney Damage Parents Should Know

Many children are now diagnosed before birth with kidney dilation, also called hydronephrosis.

For parents, the key question is whether it is harmless or whether it needs treatment or surgery.

Two important causes are PUJO, or pelvi-ureteric junction obstruction, and PUV, or posterior urethral valves.

In PUJO, there is a narrowing where the kidney joins the ureter, so urine cannot drain freely.

This causes urine outflow obstruction and swelling of the kidney, known as hydronephrosis.

PUJO is one of the most common causes of antenatal hydronephrosis.

After birth, many children are asymptomatic, but some may present with UTI, abdominal pain in older children, or a palpable abdominal lump.

Evaluation usually includes serial ultrasound scans and a diuretic renogram such as DTPA, LLEC, or MAG3 to assess drainage and split renal function.

Surgery is considered if hydronephrosis is increasing, drainage is poor, kidney function falls below 40 percent, or the child develops symptoms such as pain or infection.

The standard treatment is pyeloplasty, which removes the narrowed segment and reconnects the healthy ureter to the kidney pelvis. In selected cases, this can be done laparoscopically.

The prognosis is usually excellent, especially when surgery happens before significant damage occurs.

PUV occurs only in boys. A membrane in the urethra blocks urine flow, causing high bladder pressure and back pressure to the ureters and kidneys.

Because both the bladder and kidneys are affected, this condition needs urgent attention.

After birth, babies may have a poor urinary stream, straining, dribbling, recurrent UTIs, poor growth, or may present very sick with low urine output and abdominal distension.

Evaluation usually includes ultrasound, MCU or VCUG to confirm the diagnosis, renal function tests, and long-term bladder assessment.

Initial treatment focuses on catheterization in selected cases to relieve obstruction, followed by definitive endoscopic valve ablation.

Children with PUV need long-term follow-up because bladder dysfunction and chronic kidney disease can develop in severe cases.

Antenatal hydronephrosis, weak urine stream, recurrent UTIs, poor growth, and abdominal distension should never be ignored.

Not all hydronephrosis needs surgery, but some children do need timely intervention.

PUJO usually causes local obstruction and often has a very good prognosis, while PUV can affect the whole urinary system and needs urgent attention plus long-term follow-up.

Early diagnosis helps preserve kidney function for life.