Angiolymphoid hyperplasia with eosinophilia: report of a case arising from the radial artery.

A case of angiolymphoid hyperplasia with eosinophilia arising from the radial artery is presented. Histologically, there was proliferation of atypical endothelial cells forming vascular spaces and solid cords, with a background infiltrate of inflammatory cells and prominent tissue eosinophilia. Immunohistochemical studies demonstrated vimentin and factor VIII related antigen in the endothelial cells. The lymphoid infiltrate was polyclonal. These lesions, which typically occur in the dermis and subcutaneous tissue of the head and neck, are known by a variety of different names reflecting disagreement regarding their pathogenesis. The probable nature of the process is discussed.