Cancer starts when cells in the body begin to grow out of control and crowd out normal cells. Cells in nearly any part of the body can become cancer, and can then spread to other areas of the body. To learn more about cancer and how it starts and spreads, 

Neuroblastoma is a cancer that starts in certain very early forms of nerve cells, most often found in an embryo or fetus. (The term neuro refers to nerves, while blastoma refers to a cancer that starts in immature or developing cells). This type of cancer occurs most often in infants and young children.