Enterobius vermicularis in an ectopic site--perianal abscess.
D000038:Abscess / Q000209:etiology*; D000328:Adult; D001004:Anus Diseases / Q000209:etiology*; D005260:Female; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000150:complications*; D010123:Oxyuriasis