PediatricsSurgery

nephroblastoma / wilm's tumor

Q: What is the most common primary malignant renal tumor in children?

Nephroblastoma, also known as Wilms tumor, is the most common primary malignant renal tumor in children. It accounts for approximately 90% of pediatric renal tumors and 5-7% of childhood cancers.

Q: What is the peak age of presentation for Wilms tumor?

The peak age for Wilms tumor is 2-5 years. It is rare in children over 10 years of age. There is a slight female predominance.

Q: What percentage of Wilms tumors are bilateral?

Bilateral Wilms tumor occurs in 5-10% of cases. The majority of cases are unilateral. Bilateral disease is classified as Stage V.

Q: What is the most common clinical presentation of Wilms tumor?

A painless abdominal mass is the most common presenting feature of Wilms tumor. Other presentations include hematuria, hypertension (due to increased renin), fever, and abdominal pain.

Q: What is the triphasic histology of Wilms tumor composed of?

Wilms tumor characteristically shows triphasic histology consisting of blastemal (small blue cells), epithelial (tubules/glomeruloid), and stromal (fibrous/muscle/cartilage) components.

Wilms tumor, or nephroblastoma, is the most common primary malignant renal tumor in children, typically presenting between ages 2-5 years as a painless abdominal mass, and arises from embryonal metanephric blastema with characteristic triphasic histology comprising blastemal, epithelial, and stromal components. Its clinical significance lies in the strong associations with genetic syndromes such as WAGR syndrome, Denys-Drash syndrome, and Beckwith-Wiedemann syndrome, which medical students must recognize for early screening and diagnosis. With multimodal treatment including surgery, chemotherapy, and radiotherapy, favorable histology cases achieve approximately 90% survival, making early recognition of the classic presentation and avoidance of aggressive abdominal palpation due to rupture risk essential clinical knowledge.

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1. What is the most common primary malignant renal tumor in children?

2. What is the peak age of presentation for Wilms tumor?

3. What percentage of Wilms tumors are bilateral?

4. What is the most common clinical presentation of Wilms tumor?

5. What is the triphasic histology of Wilms tumor composed of?

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nephroblastoma / wilm's tumor

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