Tumor vascularity is thought to be the key element in tumor progression. Tremendous progress has been made in functional imaging by using magnetic resonance imaging (MRI) 3-Tesla (3T) and in biotechnology which can be used to investigate angiogenic gene profiles in order to identify gene signature for these tumors. In this study the investigators are proposing that patients of LGG with a higher risk of tumor progression may be selected by functional imaging and angiogenic profiles. These higher risk patients may be candidates for post-operative radiation in the future with a potential survival benefit.