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Living with Congenital posterior urethral valve

A rare condition in boys present before birth in which a blockage in the urethra makes it hard to empty the bladder.

Understanding Congenital posterior urethral valve

Congenital posterior urethral valve is a rare condition in which a membrane or flaps in the urethra block the bladder from emptying normally.

It is a blockage of the lower urinary tract that forms before birth and affects the male bladder. It can lead to kidney swelling (hydronephrosis), urine backing up toward the kidneys (vesicoureteral reflux), repeated urinary tract infections, and chronic kidney disease. GARD lists onset at any time in life.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Blocked bladder outlet
  • Swollen kidneys (hydronephrosis)
  • Urine flowing backward (vesicoureteral reflux)
  • Frequent urinary tract infections
  • Chronic kidney disease

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include genetic specialists, kidney specialists and urinary and male reproductive system specialists.

  3. Consider genetic testing

    Changes in BNC2 are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    Fetal Health Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists); Kidney specialists (nephrologists); Urinary and male reproductive system specialists (urologists)
Expert care
Expert lists: Fetal Health Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Fetal Health Foundation and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How is the blockage affecting my child's bladder and kidneys?
How often should kidney function be checked?
Which specialists should follow my child, such as a urologist?

Quick facts

Symptoms usually startany time in life
InheritanceAutosomal Recessive, X-Linked
GenesBNC2

GARD lists the BNC2 gene. Inheritance can be autosomal recessive (a changed copy from each parent) or X-linked.

GeneticKidneyUrinary and Reproductive

Also known as: congenital obstructing posterior urethral membranes; congenital posterior urethral valves; copum; posterior urethral valve; posterior urethral valves; puv

Patient organizations

Source: NIH GARD · Congenital posterior urethral valveGARD ID 7439 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Congenital posterior urethral valve.

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