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Gross specimen, microscopic findings (hematoxylin and eosin), and immunohistochemical staining of Ki-67 in the surgical specimen. (A) Gross specimen showing well circumscribed yellow to tan mass. (B, C) Histologic image shows trabecular pattern with oval to elongated tumor cells and intratrabecular hyalinization. (D) Ki-67 immunostaining using MIB1 monoclonal antibody shows characteristic peripheral membranous and cytoplasmic staining.
