Atrophic dermatofibroma
Female, 57 years-old, had brown spots located on her left flank. Clinically\nwell-defined, of firm consistency, atrophic surface measuring 3x2 cm, initially noticed\nabout 10 years ago (). She complained of\nmild itching in the area. She denied previous trauma or injection. On examination, a\ncentral depression was shown after compression of both sides of the lesion.\nAfter excision of the lesion, the histopathological examination with hematoxylin and\neosin revealed epidermal hyperplasia and, in the center of the lesion, a slight\nepidermal atrophy. In the dermis, there was a proliferation of spindle cells in\nstoriform arrangement with central retraction of the dermis (). Orceine staining revealed the absence of elastic fibers\nin the middle of the proliferation (). The\nimmunohistochemical evaluating was positive for XIIIa factor and negative for CD34,\nconfirming the diagnosis of dermatofibroma in its atrophic variety ( and ).