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Washington University Experience | NEOPLASMS (GLIAL) | Oligodendroglioma - IDH1 mutant, del 1p19q - Grade 2 | 13A3 Oligodendroglioma, Grade II (Case 13) H&E 11.jpg
There are patchy microcystic areas with abundant extracellular myxoid matrix. The tumor cells have an overall oligodendroglial-like appearance with perinuclear clearing ('halos') and nuclei that are round and regular, have coarse open chromatin, have crisp nuclear membranes, and have inconspicuous nucleoli.