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A, Histopathologic examination of the excised tissue shows a predominant infiltration of xanthomatous histiocytes with abundant foamy cytoplasm, which are admixed with lymphocytes, a few neutrophils, and eosinophils (hematoxylin-eosin; original magnification, x200). B, CD163 immunohistochemistry highlights the histiocytes (original magnification, x200). C, Absence of CD1a-positive histiocytes (original magnification, x200).
