Pinworm infestation of the appendix.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001064:Appendicitis / Q000209:etiology*; D002648:Child; D004757:Enterobius; D006801:Humans; D006920:Hygiene; D008131:London; D010123:Oxyuriasis / Q000150:complications* / Q000453:epidemiology