Inclusion Criteria:  Pre-treatment adult patients with any solid organ metastasis and at least three intraaxial brain metastases including at least one enhancing > 10 mm lesion Rim or solid enhancing lesion(s) WITH a history of non-central nervous system (CNS) pathologic proven metastatic disease will be considered as a consensus between the referring radiation oncologist or neurosurgeon and a neuroradiology Planned surgery or radiation to the metastases Ability to undergo PET magnetic resonance (MR) examination  Exclusion Criteria:  Known allergy to FDG or gadolinium based contrast agents History of impaired renal function (glomerular filtration rate [GFR] < 30) Pregnant women are excluded