IDH1 and oligodendroglioma: As mentioned in Fuller, G N's study 46, 6 thorny cases of 1p/19q FISH-positive and IDH wild-type did not meet the diagnostic criteria for "oligodendroglioma, IDH mutations, and 1p/19q codeletion." Ho-Keung Ng et, al 50 also found 5 in 185 cases(2.7 %) presented as “IDH wildtype and 1p/19q codeletion” and did not warrant a diagnosis of “oligodendroglioma, IDH mutant and 1p/19q co-deleted.” Our results also confirmed the presence of 1p/19q co-deleted and IDH wildtype oligodendrogliomas as described in the above studies.