Question 1431
A 4-year-old-boy presents with a painless right-sided abdominal mass. He is otherwise well. On ultrasound examination, there is an 8.2 cm diameter heterogeneous mass, with a ‘claw sign’ demonstrated in relation to the upper pole of the kidney. The lesion contains a number of cystic areas and a few small areas of calcification. What is the most likely diagnosis?
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