Brain metastases occur when cancer cells spread from their original site to the brain. Any cancer can spread to the brain, but the types most likely to cause brain metastases are lung, breast, colon, kidney and melanoma.
Brain metastases may form one tumor or many tumors in the brain. As the metastatic brain tumors grow, they create pressure on and change the function of surrounding brain tissue. This causes signs and symptoms, such as headache, personality changes, memory loss and seizures.
Treatment for people whose cancer has spread to the brain may include surgery, radiation therapy, chemotherapy, immunotherapy or a combination of treatments. Other treatments might be recommended in certain situations. Treatment is often focused on reducing pain and symptoms resulting from the cancer.
Signs and symptoms caused by brain metastases can vary based on the location, size and rate of growth of the metastatic tumors.
Signs and symptoms of brain metastases include:
Make an appointment with your doctor if you have persistent signs and symptoms that concern you. If you've been treated for cancer in the past, tell your doctor about your medical history.
Brain metastases occur when cancer cells break away from their original location. The cells may travel through the bloodstream or the lymph system and spread (metastasize) to the brain where they begin to multiply.
Metastatic cancer that spreads from its original location is known by the name of the primary cancer. For example, cancer that has spread from the breast to the brain is called metastatic breast cancer, not brain cancer.
Any type of cancer can spread to the brain, but some types of cancer are more likely to cause brain metastases, including:
If it's suspected that you have brain metastases, your doctor may recommend a number of tests and procedures.
Imaging tests. Magnetic resonance imaging (MRI) is commonly used to help diagnose brain metastases. A dye may be injected through a vein in your arm during your MRI study.
A number of specialized MRI scan components — including functional MRI, perfusion MRI and magnetic resonance spectroscopy — may help your doctor evaluate the tumor and plan treatment.
Other imaging tests may include computerized tomography (CT) and positron emission tomography (PET). For example, if the primary tumor causing your brain metastases is unknown, you might have a chest CT scan to look for lung cancer.
Collecting and testing a sample of abnormal tissue (biopsy). A biopsy can be performed as part of an operation to remove a brain tumor, or it can be performed using a needle.
The biopsy sample is then viewed under a microscope to determine if it is cancerous (malignant) or noncancerous (benign) and whether the cells are metastatic cancer or from a primary tumor. This information is critical to establish a diagnosis and a prognosis and to guide treatment.
Treatment for brain metastases can help ease symptoms, slow tumor growth and extend life. Even with successful treatment, brain metastases often recur, so your doctor will recommend close follow-up after treatment.
Treatment options for people with brain metastases often include medication, surgery, stereotactic radiosurgery, whole-brain radiation therapy or some combination of these. In certain situations, your treatment team may consider drug treatments for brain metastases.
What treatments are best for you will depend on the type, size, number and location of the tumors, as well as your signs and symptoms, overall health, and preferences. Talk with your doctor about your goals for treatment.
Medications can help control signs and symptoms of brain metastases and make you more comfortable. Options might include:
If surgery is an option for you and your brain metastases are located in places that make them accessible for an operation, your surgeon will work to remove as much of the cancer as possible. Even removing a portion of the tumor may help reduce your signs and symptoms.
Surgery to remove brain metastases carries risks, such as neurologic deficits, infection and bleeding. Other risks may depend on the part of your brain where your tumors are located.
Radiation therapy uses high-energy beams, such as X-rays and protons, to kill tumor cells. For brain metastases, your treatment may involve one or both of the following radiation therapy methods:
Whole-brain radiation. Whole-brain radiation applies radiation to the entire brain in order to kill tumor cells. People undergoing whole-brain radiation usually require 10 to 15 treatments over two to three weeks.
Side effects may include fatigue, nausea and hair loss. Long-term, whole-brain radiation is associated with cognitive decline.
Stereotactic radiosurgery. With stereotactic radiosurgery (SRS), each beam of radiation isn't particularly powerful, but the point where all the beams meet — at the brain tumor — receives a very large dose of radiation to kill the tumor cells. SRS is typically done in one treatment, and doctors can treat multiple tumors in one session.
Side effects may include nausea, headache, seizures, and dizziness or vertigo. The risk of long-term cognitive decline after SRS is thought to be less than that with whole-brain radiation.
In recent years, doctors and researchers have made significant advances in their understanding of whole-brain radiation, stereotactic radiosurgery and how these two methods affect people's survival, cognitive ability and quality of life. In deciding which type of radiation therapy to use, you and your doctor will consider many factors, including what other treatments you're undergoing and the potential for you to experience cancer recurrences after treatment.
In certain situations your treatment team might recommend medications to control your brain metastases. Whether medications might help you will depend on where your cancer began and your individual situation. Options might include:
Because brain tumors can develop in parts of the brain that control motor skills, speech, vision and thinking, rehabilitation may be a necessary part of recovery. Your doctor may refer you to services that can help:
Palliative care is specialized medical care that focuses on providing relief from pain and other symptoms of a serious illness. Palliative care specialists work with you, your family and your doctors to provide an extra layer of support that complements your other treatments.
Palliative care is provided by a team of specialists in medicine, psychology, spiritual care and social work. This team works to help improve the quality of life for people with cancer and their families.
No alternative medicine approaches have been proved to cure brain metastases. But complementary and alternative medicine therapies may help you cope with side effects of treatment when combined with your doctor's care. Talk with your doctor about your options.
Examples of complementary medicine approaches include:
Coping with brain metastasis requires more than enduring your symptoms. It also involves coming to terms with the news that your cancer has spread beyond its original site.
Cancer that has spread can be very difficult to cure. People with a single brain metastasis who undergo effective treatment have a better chance for long-term survival than do people with multiple metastatic tumors. Your doctor will work to minimize your pain and to maintain your function so that you can continue your daily activities.
Each person finds his or her own way to cope with a cancer diagnosis. Until you find what works best for you, consider trying to:
Come to terms with your illness. If treatment isn't helping to control your brain metastases, you and your family may want to talk with your doctor about end-of-life care options, such as hospice.
Coming to terms with the fact that your cancer may no longer be curable can be difficult. For some people, having a strong faith or a sense of something greater than themselves makes this process easier.
Others seek counseling from someone who understands life-threatening illnesses, such as a medical social worker, a psychologist or a chaplain. Many people also take steps to ensure that their end-of-life wishes are known and respected by writing down their wishes and discussing them with their loved ones.
Start by seeing your primary care doctor if you have any signs or symptoms that worry you. Tell your doctor if you've been treated for cancer in the past, even if you received cancer treatment many years ago.
If you're diagnosed with brain metastases, you'll be referred to a doctor who specializes in brain metastases (neuro-oncologist) or disorders of the nervous system (neurologist). Depending on the severity of your symptoms, you may also need to see a radiation oncologist or a brain surgeon (neurosurgeon).
Preparing a list of questions can help you make the most of your time with your doctor. For brain metastases, some basic questions to ask your doctor include:
Your doctor is likely to ask you a number of questions, including:
