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Histology of the tumor. (A) Well-circumscribed nodule. (B) Spindle-shaped or oval-shaped cells arranged in a fascicular or sheet-like pattern. (C) Epithelioid to polygonal cells with glassy cytoplasm. (D) Intranuclear cytoplasmic pseudoinclusion (A. H&E×40. B. H&E×100, C-F. H&E×400).