Posterior Urethral Valve

Posterior urethral valves (PUV) are obstructive membranes that develop in the urethra close to the bladder. The valve can obstruct or block the outflow of urine through the urethra. When this occurs, the bladder, ureters and kidneys become progressively dilated, which can lead to damage.

Causes: –

PUV are thought to develop in the early stages of fetal development. The abnormality affects only male. This disorder is usually sporadic. However, some cases have been seen in twins and siblings, suggesting a genetic component.

Symptoms: –

• Urinary tract infection
• Weak urine stream
• Difficulty with urination
• Urinary frequency
• New onset of urinary incontinence

Testing and Diagnosis:-

We use voiding cystourethrogram to diagnose PUV. During this test, a catheter (tube) is placed through your child’s urethra into the bladder. The tube will be used to slowly fill the bladder with a solution called contrast. While the bladder is being filled, a special machine (fluoroscopy) is used to take pictures. The radiologist looks to see if any of the contrast goes back up into the kidneys. This study is used to diagnose vesicoureteral reflux. Additional pictures are taken while your child is urinating. The radiologist will look at the urethra while urine is passing to identify the blockage (PUV).

We will also look at your kidneys and bladder with a renal bladder ultrasound. This procedure uses sound waves to outline the kidneys and bladder. It will enable us to see the degree of hydronephrosis and the shape of the bladder.