Related Experiment Video
Updated: Aug 18, 2026

Murine Bilateral Renal Lymphadenectomy
Published on: December 30, 2025
Extrarenal Wilms tumour
W Apoznański1, K Sawicz-Birkowska, W Pietras
1Department of Paediatric Surgery and Urology, University of Medicine, Wrocław, Poland.
Introduction:
Nephroblastoma is one of the most common solid tumours in children. It also is the most frequent tumour found in the kidneys. In 5 % of cases it affects both kidneys at the same time. About 70 - 80 new cases of Wilms tumour are registered in Poland annually, usually in patients aged from 1 to 7 years. Extrarenal Wilms tumours are extremely rare. Due to its rarity, series with more cases are based upon material collected from many clinical centers.
Aim:
We would like to present a case of a boy in whom we diagnosed nephroblastoma in the retroperitoneal space 14 years after he had completed a complex therapy for bilateral Wilms tumour.
Conclusion:
The development of an extrarenal tumour 14 years after complex treatment for bilateral nephroblastoma is related to the survival of metanephros located outside the kidney.
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