title: Breast nodule produced by Dirofilaria tenuis.
abstract: A case of Dirofilaria tenuis presenting as a breast nodule is reported in a patient who traveled to the southeast United States 6 months before the nodule was noted. It illustrates an unusual diagnostic problem, especially since it presented in a nonendemic area. The morphological criteria for diagnosis of D. tenuis in tissue sections are noted.
mesh_terms: D000818:Animals; D001941:Breast Diseases / Q000469:parasitology* / Q000473:pathology; D004184:Dirofilariasis / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D011821:Raccoons; D014195:Travel; D014481:United States; D015047:Zoonoses / Q000469:parasitology*