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Fig. 4 Histopathologic features of case 4. (A) This tumor also presented as a deep-dermal, somewhat circumscribed lesion with areas of peripheral infiltration (B). (C) At the periphery, the cells often lined up in a single file pattern. (D) Pseudocyst-like spaces with proteinaceous secretions were noted as well as several mitotic figures (E). (F) SOX10 and (G) S100 stains are diffusely positive.
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