Enhanced T2-FLAIR images (A, C, and E) and CBF maps (B, D, and F) of a 69-year-old man with oligoastrocytoma (WHO grade II; Ki-67 index, 10%), a 42-year-old man with glioblastoma (WHO grade IV; Ki-67 index, 20%), and a 43-year-old man with glioblastoma (WHO grade IV; Ki-67 index, 60%), respectively. Note that blood flow is significantly elevated in the glioblastoma with a relatively low Ki-67 index, while it is not elevated in the glioblastoma with a very high Ki-67 index. The unit for CBF maps is milliliters/100 g/min.