Q64: Other congenital malformations of urinary system

Q64.2: Congenital posterior urethral valves

The urethra channels the urine outward from the bladder. While developing in the womb, many different types of tissue develop in the body. The organs and body parts develop out of the various types of tissue. If tissue does not develop properly in the womb, defects can result.

Because of a defect, there are sail-like folds in the inner wall of the urethra. These folds are also known as urethral valves. When urinating, urine can flow into the urethral valves. The urethral valves then swell like a sail. The swollen urethral valves can prevent the urine from flowing away.

If urine is not able to flow away properly, it can back up. The urinary tract can then become enlarged. The urinary organs can also become more susceptible to pathogens. Restricted urine drainage can cause permanent damage to the urinary organs.