 - CNS metastatic disease with 5 to 25 CNS mets that require treatment note that previous SRS, WBRT, and resection for previous CNS mets is allowed. At time of protocol treatment, patient must have 5 or more new or progressing CNS mets that require treatment, this includes new lesions not before seen or progression of previous lesions.. While definition of new lesions is fairly straightforward, the definition of progression of old lesion is at the discretion of the treating team but it is recommended that progression be defined by a multidisciplinary team radiation oncologist, neurosurgeon, neuro-radiologist. Note that treatment of tumor bed does not count as treatment of an active lesion. 