Objectives: We seek to compare a new, non-invasive method of assessing neo-vascularization, dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) with a gold-standard-microvessel counts-and to see if we can identify gene expression patterns within the tumor itself, from areas shown as low flow versus those that are high-flow on DCE-MRI if there are features within the tumor itself that influence the degree of neovascularization. This prospective study will only be utilized in conjunction the protocol entitled "Analysis of Brain Metastasis in Patients with Breast Cancer, with and without over-expression of HER-2" that is evaluating breast tumors metastatic to the brain.