Background: Wilms tumor (nephroblastoma) is a malignant pediatric tumor that arises from mesodermal embryological precursors of renal parenchyma. Lung metastasis as the first presentation of nephroblastoma occurs in 20% of cases. However. haematogenous spread to the lungs or to regional lymphnodes from a previously diagnosed nephroblastoma occurs in of 85% of cases. https://foldlyers.shop/product-category/av-senders/