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Histologic examination of pigmented dermatofibrosarcoma protuberans (Bednar tumor) shows plump, spindle cells arranged in a storiform pattern in central areas of the tumor and a diffuse infiltration of the dermal stroma and subcutis.
Enjoji, "Bednar Tumor (Pigmented Dermatofibrosarcoma Protuberans): An Analysis of Six Cases," Pathology International, vol.
Morohashi, "An ultrastructural and immunohistochemical study of pigmented dermatofibrosarcoma protuberans (Bednar tumor)," European Journal of Dermatology, vol.