Sometimes cancer that starts elsewhere in the body can spread to the brain. Brain metastases are typically associated with known advanced cancer and usually cause neurological symptoms. Occasionally, a brain lesion may be found unexpectedly on imaging before a primary cancer has been identified. An MRI may show changes in brain tissue that could be consistent with secondary deposits. Identifying secondary spread early may expand the treatment options available and allows for faster clinical follow up. MRI is the gold standard for detecting and characterising brain metastases, offering superior sensitivity to CT for small lesions.
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