<prompt> Which of the following is the most common malignant tumor of infancy?NeuroblastomaWilms tumorPolycystic kidney diseaseRenal cell carcinoma  <response>: a. NeuroblastomaRef: Nelsons 20e p 2417, Ghai 8e 616Both Neuroblastoma Wilms tumor can present as a solid abdominal mass with calcifications.As the child in the given question is an infant, Neuroblastoma is the best answer. 