Common pediatric cancers: Wilms tumor, neuroblastoma, leukemia comparison
RezzyPediatric oncology can feel like a lot to juggle, but when you break down the "big three"—Wilms tumor, neuroblastoma, and leukemia—the clinical pictures actually look quite different!
Leukemia is the most common overall, while Wilms and neuroblastoma are the classic "abdominal mass" differentials that every med student needs to distinguish. I've put together a comparison table to help you keep the high-yield facts straight for your USMLE prep.
| Feature | Wilms Tumor (Nephroblastoma) | Neuroblastoma | Leukemia (ALL is most common) |
|---|---|---|---|
| Origin | Renal (metanephric blastema) | Neural crest cells (adrenal medulla/sympathetic chain) | Bone marrow (lymphoid or myeloid precursors) |
| Typical Age | 2–5 years | < 2 years (often infancy) | 2–5 years (peak for ALL) |
| Presentation | Smooth, firm, unilateral abdominal mass; usually does not cross midline | Irregular, nodular abdominal mass; crosses midline | Fever, pallor, bruising (pancytopenia), bone pain, lymphadenopathy |
| Key Symptoms | Hematuria, hypertension (renin secretion) | Opsoclonus-myoclonus ("dancing eyes/feet"), periorbital ecchymosis ("raccoon eyes") | Hepatosplenomegaly, CNS involvement, testicular swelling |
| Lab Findings | Normal catecholamines | Elevated VMA/HVA (catecholamine metabolites) in urine | Blasts on peripheral smear/bone marrow biopsy |
| Associations | WAGR syndrome, Beckwith-Wiedemann, Denys-Drash | N-myc amplification (poor prognosis) | Down Syndrome (increased risk for ALL and AML) |
The "midline" rule is usually the biggest clue in board questions—if the mass stays on one side, think Wilms; if it crosses over, think Neuroblastoma.
To help you visualize these, I'll find some medical diagrams showing the typical presentation and anatomical locations for these tumors.
That CT comparison is perfect for seeing how Wilms tumor arises from the kidney (the "claw sign"), while neuroblastoma is an external mass that just pushes the kidney aside.
I've also found some great lessons and flashcards that go deeper into the genetic associations like the WT1 gene for Wilms and N-myc for neuroblastoma.
🗂️ Pediatric Cancer Flashcards
Tap to study 2 flashcards in the Oncourse app
📚 Pediatric Oncology Lessons
This comparison highlights the key radiographic differences: Wilms tumor (left) is intrarenal and well-circumscribed, while Neuroblastoma (right) is extrarenal and displaces the kidney.
I've also pulled up some high-yield lessons and flashcards to help you master these topics. The "nerd candy across the belly" mnemonic for neuroblastoma is a classic for remembering that it crosses the midline!
Is there a specific one of these you'd like to dive deeper into, or maybe you'd like to try a quick quiz to see how well you can differentiate them?
Setting up chat...