- Patients must have 1-3 brain metastases seen on MRI or CT imaging. At least one brain metastases must be considered resectable by craniotomy as determined by the treating neurosurgeon. Brain lesion resection must be considered standard of care. A not uncommon situation is for a patient to undergo resection of a solitary metastasis, but prove to have more lesions on subsequent MRIs (perhaps too small to be seen on a pre-operative MRI). These patients will be eligible if the total number of lesions is 1-3.