ON THIS PAGE: You will find some basic information about this disease and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Childhood Central Nervous System Tumor. Use the menu to see other pages. Think of that menu as a roadmap for this complete guide.
A central nervous system (CNS) tumor begins when healthy cells in the brain or the spinal cord change and grow out of control, forming a mass. A tumor can be cancerous or benign. A cancerous tumor is malignant, meaning it can grow and spread to other parts of the body. A benign tumor means the tumor can grow but will not spread.
A CNS tumor is especially problematic because a person’s thought processes and movements can be affected. This type of tumor may be challenging to treat because the tissues around the tumor are often vital to the body’s functioning.
The brain is the center of thought, memory, and emotion. It controls the 5 senses, which include smell, touch, taste, hearing, and sight. It also controls movement and other basic functions of the body, including heartbeat, circulation, and breathing. The spinal cord consists of nerves that carry information back and forth between the body and the brain.
Anatomy of the brain
The brain is made up of 4 major parts: the cerebrum, cerebellum, brain stem, and meninges.
The cerebrum, the largest part of the brain, contains 2 cerebral hemispheres and is divided into 4 lobes where specific functions occur.
The frontal lobe controls reasoning, emotions, problem solving, and parts of speech and movement
The parietal lobe controls the sensations of touch, pressure, pain, and temperature
The temporal lobe controls memory and the sense of hearing
The occipital lobe controls vision
The cerebellum, or "little brain," is located underneath the cerebrum. The cerebellum controls coordination and balance.
The brain stem, which is the lowest portion of the brain and connects to the spinal cord, controls involuntary functions essential for life, such as a person’s heartbeat and breathing.
The meninges are the membranes that surround and protect the brain and spinal cord. There are 3 meningeal layers, called the dura mater, arachnoid, and pia arachnoid.
Types of CNS tumors
There are many different types of CNS tumors. Some are cancerous and very likely to grow and spread. These are often called very aggressive or high grade. There are also less aggressive types, often called low grade. And some types are noncancerous and not likely to grow and spread. In addition, there are variations within each type that affect how quickly the tumor will grow. Many of these differences depend on genetic changes found within the tumor (see Diagnosis).
The following types of CNS tumors are most common among children:
This section covers CNS tumors diagnosed in children. Learn more about brain tumors in adults.
Looking for More of an Introduction?
If you would like more of an introduction, explore these related items. Please note that these links will take you to other sections on Cancer.Net:
ASCO Answers Fact Sheet: Read a 1-page fact sheet that offers an introduction to CNS tumors. This fact sheet is available as a PDF, so it is easy to print out.
Cancer.Net en Español: Read about CNS tumors in Spanish. Infórmase sobre tumor del sistema nervioso central en español.
The next section in this guide is Statistics. It helps explain the number of children who are diagnosed with this disease and general survival rates. You may use the menu to choose a different section to read in this guide.