title: Pollen grain granuloma: a new clinicopathologic entity.
abstract: Chronic ulceration of the ankle developed in a woman who had been stepped on by a cow. Microscopic examination revealed a florid foreign body granulomatous reaction in which pollen grains were found both within giant cells and lying free in fibrous tissue. The grains resembled those of the Asteraceae, or Compositae, family. This is the first report of pollen grains associated with an invasive tissue process. The morphologic features of pollen grains and their differentiation from other foreign bodies are discussed.
mesh_terms: D005260:Female; D005549:Foreign-Body Reaction / Q000209:etiology / Q000473:pathology*; D006099:Granuloma / Q000209:etiology / Q000473:pathology*; D006801:Humans; D007871:Leg Ulcer / Q000209:etiology / Q000473:pathology*; D008875:Middle Aged; D011058:Pollen