Brain Metastases: Symptoms, Diagnosis, and Treatment

Brain metastases are tumors that form when cancer cells from another part of the body — most often the lung, breast, skin (melanoma), kidney, or colon — travel to the brain. They are the most common type of brain tumor in adults, and thanks to major advances in treatment, patients are living longer and better than ever before.

What are brain metastases?

Unlike tumors that begin in the brain, brain metastases start elsewhere and spread. A person may have a single metastasis or several. Because treatment has improved dramatically, a diagnosis of brain metastasis is not the emergency it once was — it is a treatable problem that is managed as part of your overall cancer care.

Common symptoms

Symptoms depend on the size and location of the tumors and may include:

• Headaches, sometimes worse in the morning
• Seizures
• Weakness or numbness on one side of the body
• Changes in vision, speech, memory, or balance
• Nausea

Some brain metastases cause no symptoms at all and are found on scans done for other reasons.

How are they diagnosed?

Diagnosis usually involves an MRI of the brain, which shows the number, size, and location of the tumors. If cancer has not been diagnosed before, additional imaging and sometimes a biopsy are used to identify the primary source.

Treatment options

Modern treatment is highly individualized and usually involves a multidisciplinary team — neurosurgery, radiation oncology, and medical oncology working together. Options include:

• Stereotactic radiosurgery (SRS). Highly focused radiation (such as Gamma Knife) that treats tumors precisely while sparing healthy brain. It is a mainstay for many patients and can treat several metastases at once.
• Surgery. Removing a metastasis is often recommended when a tumor is large, causing significant symptoms, or when a tissue diagnosis is needed. Minimally invasive and image-guided techniques allow safe removal even in delicate areas, often with a rapid recovery.
• Systemic therapy. Newer targeted therapies and immunotherapies can cross into the brain and are an increasingly important part of treatment.
• Steroids and supportive care to reduce swelling and control symptoms.

Whole-brain radiation, once standard, is now used more selectively thanks to these focused approaches.

Why the right plan matters

The best treatment depends on the number and size of tumors, your symptoms, the type of cancer, and how the rest of your cancer is being managed. A thoughtful, coordinated plan can control the disease in the brain while protecting memory, function, and quality of life.

Dr. Arnaout treats patients with brain metastases as part of a neuro-oncology team, using minimally invasive surgical techniques where surgery is the right choice.

When to see a specialist

If you or a loved one has been told about a brain metastasis, an evaluation with a neurosurgeon experienced in brain tumor care can clarify whether surgery, radiosurgery, or a combination is the best next step.

To discuss treatment options or get a second opinion, request an appointment.