Some boys are born with posterior urethral valves (PUV). These are extra flaps of tissue that are in the tube that carries urine out of the body. Babies with PUV may not be able to be normally – both while growing in the womb and after they are born.

PUV may be suspected during pregnancy, on the antenatal ultrasound scan. PUV is diagnosed after birth with some tests. In some cases, they are diagnosed when a boy is older.

PUV need to be removed by surgery. Sometimes, other treatment is needed. Boys who have had PUV may have problems in their kidneys and/or bladder later in childhood, and will need follow-up throughout their lives.

Symptoms and complications

PUV can cause serious problems because they stop – or partially stop – urine flowing out of the bladder and through the urethra. After the PUV are removed by surgery, some boys have no symptoms or complications. In other cases, they can cause other problems shortly after birth or later in life, which need further treatment.

  • Occasionally, newborn babies are unable to breathe properly because the PUV leads to problems with their lungs. They need special care after birth to help them breathe.
  • PUV may cause bladder problems, and some boys have problems passing urine. A few will need to use a catheter (a long, thin tube that is placed through the urethra) to help empty their bladder.
  • PUV may cause the kidneys to swell – this is called antenatal hydronephrosis, and is a common problem for babies in the womb. Occasionally, this causes more serious problems.
  • Boys with PUV may be more likely to get urinary tract infections (UTIs) when germs get into the urine and cause infection and illness. These are treated with medicines. In some cases, boys with PUV get a serious infection in their kidneys or in their blood.
  • PUV may cause vesicoureteral reflux (VUR) – when urine refluxes (goes back up) the wrong way towards or into the kidneys
  • Occasionally, PUV can cause, or happen with, more serious problems with the kidneys.


PUV are extra flaps of tissue that are in the back (posterior) part of the urethra. They develop while a baby boy is growing in the womb.

PUV are the most common type of bladder outlet obstruction in newborn babies. This means that they stop (obstruct) the flow of urine out of the bladder.

PUV are rare. In India, it is estimated that one newborn boy in 5,000 to 8,000 has PUV. It is not known why some boys have PUV. They are not inherited from the mother or father, or caused by anything that the mother does during her pregnancy.

PUV may happen with other anomalies or abnormalities in the urinary system. This may mean that one or both kidneys or ureters do not develop properly.


Before birth

In most cases, there is no treatment before birth. In a small number of cases, an operation may be recommended during pregnancy. This aims to drain urine out of the baby’s bladder and into the amniotic fluid (or liquor) that surrounds the baby.

Where is my baby or child treated?

Some babies need to go into a neonatal unit, an area of the hospital for newborn babies who need support, for tests and treatment. Older children are treated in a paediatric unit, a special part of your hospital, for children. Some children need to be transferred to another hospital where specialist services are available.

After birth

The first treatment is to drain urine from the bladder. This helps reduce the risk of long-term problems with the bladder and kidneys. A catheter (a long, thin tube) is placed through the urethra (from the tip of your child’s penis), or sometimes through the wall of the tummy, into the bladder, and urine flows out.

All boys need an operation to remove the PUV  – this is called a PUV resection. This will happen shortly after diagnosis.