Theory and Science — Practice
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Nephro-urology
A 3‑year‑old boy has a 3‑week history of an enlarging, painless abdominal mass that does not cross the midline. He is hypertensive (BP 115/80 mmHg, >95th centile). Urinalysis shows microscopic haematuria. Abdominal ultrasound shows a solid intrarenal mass with a “claw sign”. What is the most likely diagnosis?