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Living with Congenital primary megaureter

A condition in which the tube from the kidney to the bladder (ureter) is wider than usual, though the bladder is normal.

Understanding Congenital primary megaureter

Congenital primary megaureter is a condition in which the ureter, the tube carrying urine from the kidney, is widened, while the bladder and its outlet are normal.

The cause is not known. The widened ureter may be blocked, may let urine flow backward (reflux), or may be neither. It can show up at a variety of ages.

Signs & symptoms

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

  • Frequent urinary tract infections
  • Swollen kidney (hydronephrosis)
  • Urine flowing backward (vesicoureteral reflux)
  • Fever
  • Abdominal pain
  • Kidney stones

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Genetic specialists (geneticists); Kidney specialists (nephrologists); Urinary and male reproductive system specialists (urologists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 National Kidney 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
Is the widened ureter blocked, refluxing, or neither?
How often should the kidneys be checked?
When would a urologist recommend treatment or surgery?

Quick facts

Symptoms usually starta variety of ages

GARD says changes in genes cause this condition, though it also calls the condition idiopathic, meaning the exact cause is unknown. It doesn't name a gene.

GeneticKidneyUrinary and Reproductive

Also known as: congenital primary megalo-ureter

Patient organizations

Source: NIH GARD · Congenital primary megaureterGARD ID 18700 · 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 primary megaureter.

Explore the Congenital primary megaureter blog

Explore research for Congenital primary megaureter

Explore actively recruiting Congenital primary megaureter studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Congenital primary megaureter with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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