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The provided images depict a retroperitoneal PEComa with moderate malignancy. Image A reveals tumor cells with moderate atypia and multinucleated tumor giant cells at a magnification of 200x. Image B demonstrates HMB45 positivity in tumor cells at a magnification of 100x. Image C displays 20% positivity of Ki-67 in tumor cells at a magnification of 200x. Lastly, image D exhibits the absence of Vimentin in tumor cells at a magnification of 100x.
