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Microscopic examination showing a proliferation of spindle cells with a bundle or flow pattern (hematoxylin and eosin staining). (A) Clusters of spindle cells are readily identifiable. No nuclear atypia, mitotic activity or necrosis are evident (×200). (B) Immunohistochemical examination showing that the tissue is bcl-2-positive (×200). (C) Immunohistochemical examination showing that the tissue is CD34-positive (×100).
