Angiolymphoid hyperplasia with eosinophilia. A clinicopathologic study of 116 patients.

The clinicopathologic spectrum of angiolymphoid hyperplasia with eosinophilia (ALHE) is reported through a study of 116 cases (67 male and 49 female) submitted to the Armed Forces Institute of Pathology. The lesions are most common in the head-neck region and are characterized by single or multiple smooth-top papules or plaques of varying color. Microscopically, ALHE consists of anomalous vascular proliferations and varying degrees of nodular and diffuse lymphocytic infiltrates with eosinophils at all levels of the corium and subcutaneous tissue. In fifty-three cases an arterial structure, confirmed by the presence of an internal elastic lamina, was observed in close association with venular structures or was the site of endothelial cell proliferation. ALHE comprises a spectrum of unusual vascular proliferation with inflammation, encompassing such entities as inflammatory angiomatous nodules, pseudo or atypical pyogenic granuloma, histiocytoid hemangioma, epithelioid hemangioma, and Kimura's disease. The existence of arterial structures among venules and endothelial cell proliferations suggests the presence of arteriovenous (AV) shunts, which may help explain the pathogenesis and biologic behavior of this condition.