Figure 2. With(a) trace diffusion-weighted images, the lesion appears slightly more hyperintense than the brain parenchyma, while it is (b) markedly hypointense in apparent diffusion coefficient (ADC) images. The ADC value of the lesion is 0.49 x 10^–3 mm² s^–1. The MR spectrum shows no N-acetyl aspartate (NAA, 2.02 ppm) peak, but (c) a prominent increase in the choline peak (Cho, 3.22 ppm). (d) Cerebral blood volume (CBV) images show that most parts of the lesion have lower intensity than the brain parenchyma without prominent enhancement. There is a slight enhancement around the lesion. The relative celebral blood volume ratio of the lesion is approximately 1.58.