IDH1 and astrocytoma (excluding glioblastoma): Although the previous cohort study showed that the FLAIR scanned with TI less than 2,400 ms in 3 Tesla (T) magnetic resonance (MR) machine improved the detectability of T2-FLAIR mismatch sign, not all the astrocytoma, IDH-mutant present T2-FLAIR mismatch sign [12].