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Pediatric Wilms Tumor (Nephroblastoma)

The rare childhood tumor of the kidney, also called nephroblastoma, may be associated with several genetic alterations and syndromes. Only about 500 cases of Wilms' tumors are diagnosed each year in the United States, mostly in children ages three to four years old.

What is Pediatric Wilms Tumor (Nephroblastoma)?

Wilms' tumors can metastasize to the lungs and liver. Most children with a Wilms' tumor can be cured, but because the cancer is so rare, these children should be treated by specialists and considered for enrollment in a clinical trial.


If a child has nephroblastomatosis, risk of developing a Wilms' tumor is high. The child should be monitored for at least seven years following treatment of nephroblastomatosis for signs of Wilms' tumor.

What are the signs and symptoms of Pediatric Wilms Tumor (Nephroblastoma)?

Symptoms can vary, but many children have:

How is Pediatric Wilms Tumor (Nephroblastoma) diagnosed?

As we learn more about genetic predisposition to Wilms tumor, we know that some children have a much higher risk of Wilms tumor. Screening the children can detect the tumors while they are small and asymptomatic, helping to spare the kidney.

Children with the following conditions usually are screened with ultrasonography every three months until age 8 for signs of Wilms tumor.

  • Beckwith-Wiedemann syndrome (and other overgrowth syndromes)
  • Denys-Drash syndrome
  • Isolated hemihypertrophy
  • Sporadic aniridia
  • WAGR syndrome

Many other diseases and conditions are associated with Wilms tumors.

Other testing

  • A small percentage of renal masses are misdiagnosed as Wilms' tumors. Abdominal imaging with ultrasonography, radiography and computed tomography (CT) can help detect or define a Wilms' tumor.
  • A complete blood count, liver or renal function tests, and urinalysis can aid in differential diagnosis.

Any child with a renal mass is assessed for possible associated syndromes.

How is Pediatric Wilms Tumor (Nephroblastoma) treated?

Treatment may include:

  • Nephrectomy
  • Removal of nearby lymph nodes

If the cancer is bilateral, a partial nephrectomy is performed in one kidney to retain some renal function.

Children also receive:

  • Radiation therapy
  • Chemotherapy
  • Biologic therapy as appropriate

Children with advanced disease may require:

  • High-dose chemotherapy with a stem cell transplant
  • Kidney transplant

Pediatric Wilms Tumor (Nephroblastoma) Doctors and Providers