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Washington University Experience | NEOPLASMS (NEURONAL) | Rosette-Forming Glioneuronal Tumor (RGNT) | 4E RGNT (Case 4) Ki67 2
Ki-67 shows a very low labeling index and is positive predominantly within blood vessels. ---- Not Shown: An immunostain for IDH1 shows no reactivity. Fluorescence in-situ hybridization (FISH) studies show normal dosages of chromosome 1p and chromosome 19q; co-deletion is not present.