Fig 3. Graphs show the distribution of CBV ratios (A) and MET uptake ratios (B), respectively, in those patients with low-grade (patients 1–8) and or high-grade gliomas (patients 9–14). All samples are presented with different symbols depending on their category (, "peritumoral tissue"; , "infiltrated tissue"; , "bulk tumor"), and different colors depending on their score on the semiquantitative scale of malignancy (blue = 1, green = 2, yellow = 3, orange = 4, red = 5; see text for details).