Nephroblastoma (Wilms Tumor)
Malignant Embryonal Renal Tumor
Primary risk age: 2 to 5 Years (Peak occurrence; rare after 8 years)
- Urgency
- Severe
- Typical age
- 2 to 5 Years (Peak occurrence; rare after 8 years)
- Body system
- Oncological System
Typical course: Post-nephrectomy recovery takes 1 to 2 weeks; adjuvant chemotherapy spans 18 weeks to 6 months depending on the stage.
Reviewed against AAP · CDC · WHO · NHS guidance Last reviewed 2026-06-13
1. Summary & Pathophysiology
Malignant Embryonal Renal Tumor
Pathophysiology (Development Path)
Malignant proliferation of embryonal renal cells (metanephric blastema) that fail to differentiate into normal glomeruli and tubules. The tumor grows rapidly within the renal parenchyma, compressing normal kidney tissue but remaining encapsulated initially.
Primary Causes & Etiology
Abnormal renal development involving somatic mutations in the WT1 gene on chromosome 11; associated with syndromes like WAGR, Beckwith-Wiedemann, and Denys-Drash.
2. Symptom Continuum
- Early Onset Signs
A smooth, firm, painless abdominal mass that does not cross the midline, often discovered by parents during bathing or dressing the child.
- Progressive Phase
Mild abdominal pain, hematuria (blood in the urine), low-grade fever, and decreased appetite.
- Severe Indicators
Severe hypertension (due to increased renin release from renal ischemia), significant weight loss, and shortness of breath (suggesting pulmonary metastasis). The abdomen should never be palpated vigorously, as it can rupture the tumor capsule and spill tumor cells.
3. Clinical Verification
Abdominal ultrasound showing a solid renal mass. Confirmed with CT or MRI of the abdomen and chest (to screen for lung metastasis). Definitive diagnosis made at surgery (nephrectomy).
4. Care & Elements Plan
Primary Care Treatment Plan
Surgical removal of the affected kidney (nephrectomy), followed by adjuvant chemotherapy. Radiation therapy is added for advanced stages or unfavorable histology. Never perform a pre-operative biopsy to avoid tumor spillage.
Home Support Elements
Protect the child from abdominal trauma (no rough contact play) prior to surgery to prevent tumor rupture. Post-surgery, monitor urine output and track kidney function indicators.
Generic Active Ingredients (No Brands)
- Vincristine sulfate and Dactinomycin (standard chemotherapy active ingredients for Wilms tumor)
- Doxorubicin (added for advanced stages).
Lists active elements only. Never administer self-designed therapies.
5. Doctor Critical Lines
Critical Thresholds: When to See a Doctor
Consult a pediatrician immediately if you feel a lump or swelling in your child's abdomen, or if you notice blood in their urine.
6. Vaccine & Prevention
Routine Prophylaxis (Prevention)
Children with known predisposing syndromes (e.g., Beckwith-Wiedemann) require screening abdominal ultrasounds every 3 months until age 8.
Immunization Context
Avoid live vaccines during active chemotherapy; maintain all other vaccines post-recovery.
7. Timelines & Outlook
Active Timeline
Post-nephrectomy recovery takes 1 to 2 weeks; adjuvant chemotherapy spans 18 weeks to 6 months depending on the stage.
Expected Prognosis
Excellent. The overall cure rate for pediatric Wilms tumor exceeds 90% with modern surgical and chemotherapy protocols.
Potential Untreated Complications
Tumor rupture/spill, surgical injury to the renal vessels, chemotherapy toxicity, and chronic kidney disease in bilateral cases.
More in Solid Organ Embryonal Tumors
Severe Neuroblastoma
Malignant Embryonal Tumor of the Sympathetic Nervous System
Infants and toddlers (Median age of diagnosis is 19 months; most common solid extracranial tumor in children)
Emergency Retinoblastoma
Cancer of the developing retina; the most common eye cancer in children.
Mostly children under 5 years, including infants.