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Morphologic features and BCOR staining pattern of high-grade endometrial stromal sarcoma harboring BCOR internal tandem duplication. a) Tongue-like myometrial invasion. Low-grade fibromyxoid (b) and high-grade round cell (c) components similar to features seen in YWHAE-NUTM2 high-grade endometrial stromal sarcoma. d) Foci of myxoid stroma within the round cell component. e) More extensive nuclear atypia within the fibromyxoid component. f) Diffuse and strong BCOR expression.
