<prompt> The most common malignant neoplasm of infancy isMalignant teratomaNeuroblastomaWilms tumorHepatoblastoma  <response>: Neuroblastoma is the most frequently diagnosed neoplasm in infants accounting for 28-39 of neonatal malignancies - Nelson.Neuroblastoma Neuroblastoma is a malignant tumor of the autonomic nervous system.It has following peculiarities : -Most common abdominal cancer of childhood.Most common cancer of infancyMost common extra cranial solid tumor of childhood most common solid tumor of childhood is brain tumor.It is a neuroendocrine tumor, arising from any neural crest element of the sympathetic nervous system.Primary tumor is localized in the localization of sympathetic nervous system. 