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Washington University Experience | NEOPLASMS (GLIAL) | Oligodendroglioma - IDH1 mutant, del 1p19q - Grade 3 | 25E Oligodendroglioma, anaplastic Grade 3 (Case 25) Ki67 20X 1
Ki67 staining shows a variable proliferation rate focally up to ~20% (B2). ---- FISH studies showed evidence of 1p19q co-deletion. The collective morphological, immunohistochemical and cytogenetic features are consistent with a diagnosis of anaplastic oligodendroglioma, WHO grade 3.