 This is a single arm Phase II clinical trial. All patients will receive continuous dosing of dabrafenib at 150 mg PO bid until progression of disease, withdrawal of consent, or the development of intolerable treatment associated toxicity. An MRI will be performed after 28 days of treatment with dabrafenib. Patients who have unequivocal disease progression in the brain at that time will be deemed to have disease progression at 4 weeks. Patients with a complete response of all lesions in the brain will continue to receive dabrafenib on study but they will not undergo SRS. For patients with stable disease or partial tumor responses in the brain, Gamma Knife radiosurgery will be performed on treatment cycle 2, day 1 - 3 days, 28 day cycle using a stereotactic head frame and MRI imaging in accordance with FDA-approved procedures. 