Neuroblastoma is a disease in which malignant (cancer) cells form in nerve tissue. About 700 children are diagnosed with neuroblastoma per year. It is usually found in young children, and is the most common cancer among infants. These solid tumors can begin in nerve tissues in the neck, chest, abdomen, pelvis, or, most commonly, in the adrenal gland. They may also spread to other areas of the body, including bone and bone marrow. Diagnosis of neuroblastoma can be complicated because its symptoms mimic so many other diseases. In the majority of cases, neuroblastoma has already spread to areas outside of the original site at the time of diagnosis. The success rate for kids, like Matty, with stage 4 high risk neuroblastoma is less than 50%.