A 3-week-old child presents with an abdominal mass. What is the most common cause of the presentation?: (A) Neuroblastoma, (B) Wilms tumor, (C) Multicystic dysplastic kidney, (D) Distended bladder
Answer is C. c. Multicystic dysplastic kidney(Ref: Nelson's 20/e p 2555)Multicystic dysplastic kidney is the most common cause of an abdominal mass in the newborn, but the majority are nonpalpable at birth.