A mother brings in her 4-year-old daughter because she felt a “lump” on her abdomen and she feels her daughter's belly is swollen. The mother states her daughter is pretty healthy but has been stating that her stomach hurts on and off. Physical exam reveals a nontender abdominal mass that is firm and does not cross the midline. Based on this presentation, a possible diagnosis is: Group of answer choices polycystic kidney disease. dysplastic kidney. nephroblastoma. renal cell carcinoma.