Primary tumors are composed of cells just like those that belong to the organ or tissue where they start. A primary brain tumor starts from cells in the brain. Most brain tumors in children are primary, and at least half of all primary tumors originate from cells of the brain that support the body's nervous system. Tumors related to the nervous system are called gliomas , and they originate in the brain's glia cells. Secondary tumors are made up of cells from another part of the body that have spread to one or more areas.
Brain tumors can also be benign or malignant.
Benign tumors grow slowly and do not spread. Malignant tumors grow quickly and can spread to surrounding tissues. For specific medical advice, diagnoses, and treatment, consult your doctor.