Cancer that arises in immature nerve cells and affects mostly infants and children.
Biology Dictionary
Definition:
A sarcoma which is made up of primitive neural tissue, developing most often in the brain or in the adrenal glands above the kidneys and frequently spreading to other organs. This cancer most often strikes children under 10.
A neuroblastoma is a tumor of the neural crest tissue of the sympathetic ganglia or adrenal medulla. It is one of the most common malignant tumors of infants under 5 years old.
WordNet Dictionary