Naczyniak brodawkowaty

A rare vascular anomaly characterized by congenital, solitary or grouped, red-to-purple plaques which may bleed and enlarge over time. The lesions show a predilection for the lower extremities. Histological examination reveals numerous dilated, congested capillaries and venules in the papillary dermis, often with a deep dermal component, and with increased density of variably congested capillaries and venules also in the subcutaneous tissue. The overlying epidermis displays prominent acanthosis, papillomatosis, hyperkeratosis, parakeratosis, and crusting.