Early diagnosis can be an important factor in the outcome of tumors in the brain. Brain tumors are the second leading cause of cancer death in children under age 15 and the second fastest growing cause of cancer death among those over age 65. Over the next year, more than 100,000 people in the United States will be diagnosed with a brain tumor.
Types of Brain Tumors
Primary Brain Tumors
Tumors that begin in brain tissue are known as primary brain tumors and are classified by the type of tissue in which they originate. The most common brain tumors are gliomas, which begin in the glial or supportive tissue. There are several types of gliomas:
- AstrocytomasThese tumors arise from small, star-shaped cells called astrocytes. They may grow anywhere in the brain or spinal cord. In adults, astrocytomas most often arise in the cerebrum. In children, they occur in the brain stem, the cerebrum and the cerebellum. A grade III astrocytoma is sometimes called anaplastic astrocytoma. A grade IV astrocytoma is usually called glioblastoma multiforme.
- Brain stem gliomasThese tumors occur in the lowest, stem-like part of the brain. The brain stem controls many vital functions. Most brain stem gliomas are high-grade astrocytomas.
- EpendymomasThese tumors usually develop in the lining of the ventricles. They may also occur in the spinal cord. Although these tumors can develop at any age, they are most common in childhood and adolescence.
- OligodendrogliomasThese tumors occur in the cells that produce myelin, the fatty covering that protects nerves. These tumors usually arise in the cerebrum. They are rare, grow slowly and usually do not spread into surrounding brain tissue. They occur most often in middle-aged adults but have been found in people of all ages.
There are other types of brain tumors that do not begin in glial tissue. Some of the most common are described below:
- MedulloblastomasThese tumors were once thought to develop from glial cells. However, recent research suggests that these tumors develop from primitive or developing nerve cells that normally do not remain in the body after birth. For this reason, medulloblastomas are sometimes called primitive neuroectodermal tumors (PNET).
Most medulloblastomas arise in the cerebellum; however, they may occur in other areas as well. These tumors occur most often in children and are more common in boys than in girls.
- MeningiomasThese tumors grow from the meninges, or membranes that enclose the brain and spinal cord. They are usually benign. Because these tumors grow very slowly, the brain may be able to adjust to their presence. Meningiomas often grow quite large before they cause symptoms. They occur most often in women between 30 and 50 years of age.
- SchwannomasThese tumors are benign and begin in Schwann cells, which produce the myelin that protects the acoustic nerve, or the nerve of hearing. They occur mainly in adults. These tumors affect women twice as often as men.
- CraniopharyngiomasThese tumors develop in the region of the pituitary gland near the hypothalamus. They are usually benign but are sometimes considered malignant because they can press on or damage the hypothalamus, a region of the brain, and affect vital functions. These tumors occur most often in children and adolescents.
- Germ cell tumorsThese tumors arise from developing sex cells or germ cells. The most frequent type of germ cell tumor in the brain is the germinoma.
- Pineal region tumorsThese tumors occur in or around the pineal gland, a tiny organ near the center of the brain. The tumor can be slow growing (pineocytoma), or fast growing (pineoblastoma). The pineal region is very difficult to reach, and these tumors often cannot be removed.
Secondary Brain Tumors
Metastasis is the spread of cancer. Cancer that begins in other parts of the body may spread to the brain and cause secondary tumors. These tumors are not the same as primary brain tumors. Cancer that spreads to the brain is the same disease and has the same name as the original or primary cancer. For example, if lung cancer spreads to the brain, the disease is called metastatic lung cancer because the cells in the secondary tumor resemble abnormal lung cells, not abnormal brain cells.
Treatment for secondary brain tumors depends on where the cancer started and the extent of the spread as well as other factors, including the patient's age, general health and response to previous treatment.
Our Approach to Brain Tumor
As one of the largest and most comprehensive brain tumor programs in the U.S., we are committed to providing the best possible outcomes and quality of life to our patients. We offer the latest treatments and techniques, such as brain mapping during surgery to protect brain function and radiosurgery, a nonsurgical treatment that delivers high radiation doses to a precise target in the brain. Our patients also have access to clinical trials evaluating promising new treatments, and to supportive care and resources for themselves and their families.
Awards & recognition
Best in the West for neurology and neurosurgery
Ranked No. 3 in the nation for neurology and neurosurgery
Ranked No. 12 in the nation for cancer care
in the U.S. for number of brain tumor patients treated
UCSF Health medical specialists have reviewed this information. It is for educational purposes only and is not intended to replace the advice of your doctor or other health care provider. We encourage you to discuss any questions or concerns you may have with your provider.