Brain Metastasis
Brain metastasis refers to cancer that has spread to the brain from another part of the body. These secondary brain tumours are more common than primary brain tumours (tumours that originate in the brain). Brain metastasis can develop in any part of the brain and often indicate advanced cancer.
The symptoms of brain metastasis depend on the size, number, and location of the tumours. Common symptoms include:
- Headaches: Persistent or worsening headaches, sometimes with nausea or vomiting
- Seizures: Sudden, uncontrolled electrical activity in the brain
- Weakness or numbness: Often on one side of the body
- Difficulty with speech or understanding language
- Vision problems: Blurred or double vision, or loss of vision
- Changes in behaviour or personality
- Loss of balance or coordination
- Confusion or memory problems
What are the symptoms?
What are the causes and risk factors?
Brain metastasis occurs when cancer cells break away from a primary tumour and spread to the brain via the bloodstream or lymphatic system. Common cancers that metastasize to the brain include:
Lung cancer
(most common)
Breast cancer
Melanoma
(skin cancer)
Kidney cancer
Colorectal cancer
Risk factors include:
Having a cancer diagnosis
Certain types of cancer are more likely to spread to the brain.
Advanced cancer
Metastasis is more common in later stages of cancer.
Weakened immune system
May allow cancer cells to spread more easily.
What are the complications from the condition?
Brain metastasis can lead to serious complications, including:
- Increased intracranial pressure: Tumours can cause swelling or block fluid flow, leading to headaches and brain damage.
- Neurological deficits: Permanent loss of movement, speech, or cognitive abilities.
- Seizures: Recurrent and difficult to control in some cases.
- Life-threatening situations: Large or multiple tumours can severely impact brain function and lead to death.
How is it diagnosed?
Diagnosis involves imaging and other tests to confirm the presence of brain metastasis and their source. Common tests include:
- MRI (Magnetic Resonance Imaging): The most accurate imaging tool to detect brain tumours
- CT Scan: Used when MRI is unavailable or to quickly assess the brain
- Biopsy: Sometimes performed to confirm the diagnosis, especially if the primary cancer is unknown
- PET Scan: Can help identify the primary tumour and other metastatic sites
- Blood Tests: To check for markers of cancer or other abnormalities
How is it treated?
Treatment focuses on managing symptoms, slowing tumour growth, and improving quality of life. Options include:
- Medications
- Steroids: To reduce swelling in the brain
- Anti-seizure drugs: To prevent or manage seizures
- Radiation Therapy
- Whole-brain radiation therapy (WBRT): Used for multiple tumours
- Stereotactic radiosurgery (SRS): A targeted form of radiation for small, well-defined tumours
- Surgery: Removal of tumours when they are accessible and causing severe symptoms
- Chemotherapy or targeted therapy: Depending on the type of primary cancer, systemic treatments may be used to control cancer spread
- Immunotherapy: Helps the immune system fight cancer cells
Frequently Asked Questions
Can brain metastasis be cured?
While brain metastasis are usually not curable, treatments can control their growth and improve symptoms.
What cancers most commonly spread to the brain?
Lung cancer, breast cancer, melanoma, kidney cancer, and colorectal cancer are the most common.
How long can someone live with brain metastasis?
Survival varies depending on factors like the number of metastasis, primary cancer type, and treatment. Some patients live months to years with effective treatment.
Are brain metastasis the same as primary brain tumours?
No, primary brain tumours start in the brain, while brain metastasis spread from cancer elsewhere in the body.
Is radiation therapy effective for brain metastasis?
Yes, radiation is one of the most effective treatments, particularly stereotactic radiosurgery for small tumours.
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