Neuroblastoma is a cancer of specialised nerve cells which are involved in the development of the nervous system and other tissues.
Neuroblastoma can occur anywhere in the body, In some children, neuroblastoma is found in the neck, in nerve tissue in the chest, and also around the spinal cord.
The cancer can appear in different parts of the body, but it usually occurs in the abdomen (stomach) as a swelling, in the adrenal gland and usually in children under five.
Apart from brain tumours, this is the most common solid tumour found in children.
Like other cancers, no cause has been found for neuroblastoma.