As an example, we highlight a HAVOC map generated on a large recurrent isocitrate dehydrogenase (IDH)–mutated 1p19q-codeleted anaplastic oligodendroglioma, central nervous system (CNS) World Health Organization (WHO) grade 3, showing heterogeneous radiographic signal and measuring 4.4 cm in maximum dimensions. Here, IDH3A is linked to anaplastic oligodendroglioma.