Actinic granuloma. An ultrastructural study of two cases.

Ultrastructural findings in 2 cases of actinic granuloma are presented. The changes observed at the periphery of the lesion and in the elastic fibers, with early stage of damage, were similar to those described in actinic elastosis. Later, an histiocytic reaction which was apparently directed against damaged elastic fibers was observed. The ultrastructure confirms the light-microscopic findings, but does not clarify the etiology of the lesion or its relation to granuloma annulare.