Abstract:

Objective To analyze the clinical and histopathologic features of eruptive microvenular hemangioma （EMVH）. Methods The clinical and histological findings in six patients with EMVH were retrospectively reviewed. Results The patients were young or middle-aged, with a median age of onset of 34 years. The ratio of males to females was 1 ∶ 1. Clinically, all the patients experienced a sudden development of widespread, asymptomatic, brunneus, flat-topped papules and plaques measuring from 0.1 to 2.0 cm in diameter. Histopathologic examination revealed a poorly circumscribed proliferation of small, irregularly branched, thin-walled blood vessels haphazardly arranged between collagen fiber bundles in the dermis. The lumina of the blood vessels were often collapsed. There was no cellular atypia or mitosis. A variable degree of sclerosis was noted in the surrounding stroma. Immunohistochemical study revealed that the endothelial cells stained positive for CD34, CD31, and factor Ⅷ-related antigen. Conclusions The diagnosis of EMVH is proposed, and awareness of this disease may benefit its early diagnosis and avoidance of unnecessary treatment

Key words: clinical and histological features