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Histological and immunohistochemical findings of the tumors. A: Histology of the tumor. The tumor is composed of cellular spindle cells. Hematoxylin and eosin (× 200). B: KIT immunostaining of the tumor. KIT is diffusely and strongly positive in the tumor cells (× 200). C: CD34 immunostaining of the tumor. CD34 is diffusely and strongly positive in the tumor cells (× 200).
