IDH1 and oligodendroglioma: Among these, oligodendrogliomas, IDH-mutant, and 1p/19q-codeleted are typically located in the frontal lobe with cortical-subcortical involvement, commonly occur in younger adults, and may exhibit a cortical high-flow sign on arterial spin labeling (ASL), aiding in their noninvasive differentiation from other diffuse gliomas [30].