Abstract
Dermal dendrocyte hamartomas are extremely rare; only two examples have been described with clinical features different from our cases and with incomplete immunohistochemical characterization. We report three female patients presenting a medallion-shaped, well-defined, slightly atrophic and asymptomatic congenital lesion. All 3 patients showed a fusiform-cell proliferation. Immunohistochemistry was positive for CD34, factor XIIIa, and fascin. Electronmicroscopy showed typical features of dermal dendrocytes. We believe that the lesions described represent a new, clinically and histopathologically distinct lesion originating in dermal dendrocytes. We propose to name it medallion-like dermal dendrocyte hamartoma.
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