title: Prevalence and clinical implications of diverticulosis of the vermiform appendix.
abstract: OBJECTIVE
  The epidemiology and the aetiology of inflammatory diseases of the vermiform appendix remain poorly understood. The prevalence of appendiceal diverticulosis and diverticulitis in patients undergoing appendectomy for suspected acute appendicitis was investigated.
  
  
  METHODS
  A retrospective study was completed on patients who underwent appendectomy for suspected acute appendicitis. Pathology reports of all patients were screened for diverticula of the vermiform appendix. Patients with either diverticulitis of the vermiform appendix or normal appendicitis were compared.
  
  
  RESULTS
  Out of two sets of consecutive patients (n = 1073), nine (0.8%) were identified with diverticulosis of the vermiform appendix. Two of these patients had diverticulitis of the vermiform appendix without appendicitis, three had diverticulitis with consecutive localized appendicitis, and four had proper acute appendicitis with a noninflamed diverticulum of the vermiform appendix. One patient had perforated appendicitis. Two patients had an obstructing neuroendocrine carcinoid which may have caused diverticular formation.
  
  
  CONCLUSIONS
  Diverticula of the vermiform appendix are rare. If inflamed, they mimic acute appendicitis and are treated by appendectomy. If not inflamed, and diagnosed intraoperatively, incidental appendectomy is recommended.
authors.affiliation: Department of General, Visceral, Vascular and Thoracic Surgery, Hospital of Liestal, Liestal, Switzerland.
authors.forename: Samuel Andreas
authors.initials: SA
authors.lastname: Käser
authors.forename: Niels
authors.initials: N
authors.lastname: Willi
authors.forename: Christoph Andreas
authors.initials: CA
authors.lastname: Maurer
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D001062:Appendectomy; D001064:Appendicitis / Q000175:diagnosis / Q000453:epidemiology* / Q000473:pathology / Q000601:surgery; D001065:Appendix / Q000473:pathology / Q000601:surgery*; D003937:Diagnosis, Differential; D004238:Diverticulitis / Q000175:diagnosis / Q000453:epidemiology* / Q000473:pathology / Q000601:surgery; D004240:Diverticulum / Q000175:diagnosis / Q000453:epidemiology* / Q000473:pathology / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies; D013557:Switzerland / Q000453:epidemiology
keywords: Vermiform appendix; appendicitis; diverticulitis; diverticulosis; diverticulum