Metastatic brain tumor
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Metastatic brain tumor

Definition

A metastatic brain tumor is cancer that started in another part of the body and spread to the brain.

Alternative Names

Brain tumor - metastatic (secondary); Cancer - brain tumor (metastatic)

Causes

Many tumor or cancer types can spread to the brain. The most common are:

Some types of cancers rarely spread to the brain, such as colon cancer or prostate cancer.

Growing brain tumors may place pressure on nearby parts of the brain. Brain swelling due to these tumors also causes increased pressure within the skull.

Brain tumors that spread are classified based on the location of the tumor in the brain, the type of tissue involved, the original location of the tumor, and other factors. Rarely, a tumor can spread to the brain from an unknown location. This is called cancer of unknown primary (CUP) origin.

Metastatic brain tumors occur in about one-fourth of all cancers that spread through the body. They are much more common than primary brain tumors (tumors that start in the brain) and occur in 10 - 30% of adult cancers.

Symptoms

  • Decreased coordination, clumsiness, falls
  • Fever (sometimes)
  • General ill feeling or lethargy
  • Headache -- new or more severe than usual
  • Memory loss, poor judgment, difficulty solving problems
  • Numbness, tingling, pain, and other changes in sensation
  • Personality changes
  • Rapid emotional changes or strange behaviors
  • Seizures that are new
  • Speech difficulties
  • Vision changes -- double vision, decreased vision
  • Vomiting -- with or without nausea
  • Weakness of a body area

Note: Specific symptoms vary. The symptoms commonly seen with most types of metastatic brain tumor are those caused by increased pressure in the brain.

Exams and Tests

An examination shows brain and nervous system (neurologic) changes based on where the tumor is located in the brain. Signs of increased pressure in the skull are also common. Some tumors may not show signs until they are very large. Then, they cause a very quick decline in nervous system function.

The original (primary) tumor may be found by examining tumor tissues from the brain.

Tests may include:

  • Cerebral angiography
  • Chest x-ray; mammogram; CT scans of the chest, abdomen, and pelvis to find the original tumor site
  • CT scan or MRI of the brain to confirm the diagnosis and identify the tumor location (MRI is usually better for finding tumors in the brain)
  • EEG
  • Examination of tissue removed from the tumor during surgery or CT scan-guided biopsy to confirm the type of tumor
  • Lumbar puncture (spinal tap)

Treatment

Treatment depends on the size and type of the tumor, from where in the body it spread, and the patient's general health. The goals of treatment may be to relieve symptoms, improve functioning, or provide comfort.

Radiation to the whole brain is often used to treat tumors that have spread to the brain, especially if there is more than one tumor.

Surgery may be used for metastatic brain tumors when there is a single tumor and the cancer hasn't spread to other parts of the body. Some tumors may be completely removed. Tumors that are deep or that extend into brain tissue may be debulked (reduced in size).

Surgery may reduce pressure and relieve symptoms in cases when the tumor cannot be removed.

Chemotherapy for metastatic brain tumors is not as helpful as surgery or radiation.

Stereotactic radiosurgery is used at some hospitals. This form of radiation therapy focuses high-powered x-rays on a small area of the brain.

Medications for brain tumor symptoms may include:

  • Antacids or antihistamines to control stress ulcers
  • Anticonvulsants such as phenytoin or levetiracetam to reduce or prevent seizures
  • Corticosteroids such as dexamethasone to reduce brain swelling
  • Osmotic diuretics such as urea or mannitol to reduce brain swelling
  • Pain medications

When the cancer has spread, treatment may focus on relieving pain and other symptoms. This is called palliative or supportive care.

Comfort measures, safety measures, physical therapy, occupational therapy, and other treatments may improve the patient's quality of life. Some people may want to get legal advice to help them create advanced directives, such as a power of attorney.

Support Groups

You can ease the stress of illness by joining a support group where members share common experiences and problems. See: Cancer  - support group

Outlook (Prognosis)

In general, the outcome is fairly poor. For many people with metastatic brain tumors, the cancer is not curable. It will eventually spread to other areas of the body. Death often occurs within 2 years.

Possible Complications

  • Brain herniation (fatal)
  • Loss of ability to function or care for self
  • Loss of ability to interact
  • Permanent, severe loss of nervous system function that gets worse over time

When to Contact a Medical Professional

Call your health care provider if you develop a persistent headache that is new or different for you.

Call your provider or go to the emergency room if you or someone else suddenly develops stupor, vision changes, or speech impairment, or has seizures that are new or different.

References

Maity A, Pruitt AA, Judy KD, Phillips PC, Lustig R. Cancer of the central nervous system. In: Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKenna WG, eds. Abeloff's Clinical Oncology. 4th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2008:chap 70.

Deangelis LM. Tumors of the central nervous system and intracranial hypertension and hypotension. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 195.



Review Date: 2/7/2012
Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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