What is A 2-year-old male child presents with a lump in the right side of the abdomen. Ultrasound revealed it to be a solid mass. On examination, his right arm and leg were found to be longer. The most likely diagnosis is: and explain in detail?
The finding of right arm and leg to be longer suggests hemihyperophy. This is a feature of Beckwith Wiedemann syndrome associated with Wilms tumor.