How do I know if I have Wilms Tumor?

Wilms tumor, also known as nephroblastoma, is a rare kidney cancer that primarily affects children, typically presenting as a painless abdominal mass or swelling. If you or your child exhibit persistent abdominal enlargement, blood in the urine, or unexplained high blood pressure, you should seek immediate evaluation by a pediatrician or pediatric oncologist.

What are the early signs and symptoms of Wilms tumor?

Most cases of Wilms tumor are discovered because a caregiver notices a firm, painless swelling or lump in the child's abdomen. While often asymptomatic in early stages, some children may experience secondary symptoms as the Wilms tumor grows and exerts pressure on surrounding organs.

What should I look for during a self-assessment?

When assessing for Wilms tumor, look for specific physical changes. While these symptoms can be caused by many non-cancerous conditions, they warrant a professional check-up:

• A visible or palpable mass on one side of the abdomen.


• Blood in the urine (hematuria), which may appear pink, red, or tea-colored.


• Unexplained abdominal pain or persistent constipation.


• New-onset high blood pressure (hypertension) detected during routine checks.


• Fever of unknown origin or loss of appetite.

When should I talk to a doctor and what tests are used?

If you notice any of these signs, contact your pediatrician immediately. When you speak to them, be specific about when you first noticed the mass and any associated changes in bowel habits or urine. To diagnose Wilms tumor, doctors typically order an abdominal ultrasound as a first-line screening tool, often followed by a CT scan or MRI to characterize the mass. Blood and urine tests are also standard to evaluate overall kidney function.

What are the red flags requiring urgent evaluation?

Seek emergency care if a child experiences severe, acute abdominal pain, persistent vomiting, or if the abdominal mass appears to be growing rapidly. While Wilms tumor is highly treatable, these symptoms require prompt medical attention to ensure accurate staging and timely intervention.

Next steps

• Schedule an appointment with a pediatrician to discuss any concerning abdominal findings.


• Request a referral to a pediatric oncologist or pediatric urologist if a mass is suspected.


• Connect with the 18 members of the DiseaseMaps.org community who have navigated a Wilms tumor diagnosis to share experiences.


• Keep a log of symptoms, including dates and physical changes, to show your care team.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Wilms Tumor


• Orphanet: Nephroblastoma


• National Cancer Institute: Wilms Tumor and Other Childhood Kidney Tumors Treatment


• OMIM (Online Mendelian Inheritance in Man): Nephroblastoma