PLE-4777

A 5-year-old male patient was brought to the clinic because his mother noticed a gradual enlarging abdominal mass since 6 months ago. She didn’t mind it at first until she noticed it growing in size while she was bathing the child. There was also the onset of tea-colored urine observed for the past 2 months. Physical exam was unremarkable, except for the 5x5cm painless abdominal mass, which does not cross the midline. Further workup revealed hematuria. Which of the following conditions does the child probably have?