Microvenular hemangioma

Ten examples of a distinctive vascular tumor are reported. These benign acquired lesions typically occur as small, enlarging lesions that favor the extremities, particularly the forearms, of young to middle-aged adults. Clinically, they are purple to red lesions generally thought to be hemangiomas. Histologically, there is a pattern of irregular, branching venules with inconspicuous lumina and lack of cellular atypia. Because the lesions do not conform to existing classifications of vascular tumors, they have been designated with the histologically descriptive name of microvenular hemangioma. Although speculative, they are felt to represent a form of acquired venous hemangioma.