Figure 2.
A 28-year-old male patient with left frontal oligodendroglioma, WHO grade II, IDH-mutant type. (A–C) MRI axial T2W, T1W, and T2-FLAIR sequences showed clear tumor boundary, no cystic lesion, no hemorrhage, and no obvious edema around the tumor. (D) T1 postcontrast showed no obvious enhancement. (E, F) When b value was 1000, tumor was unrestricted diffusion in DWI and ADC images. (G) HE staining showed moderate increase in cell density, a small amount of nuclear atypia and loose background (×200). (H) IDH1 positive expression (×200).