Types

 acute appendicitis
 chronic appendicitis

• granulomatous appendicitis
• xanthogranulomatous appendicitis

 mural fibrosis of appendix

Etiology

 infectious appendicitis

• viral appendicitis
  • adenoviral appendicitis
  • CMV appendicitis

• bacterial appendicitis
  • Yersinia appendicitis
    • Yersinia enterocolitica appendicitis (17189675)

• appendiceal typhoid
  • appendiceal actinomycosis
  • mycobacterial appendicitis
    • tuberculous appendicitis

• fungal appendicitis
• parasitic appendicitis
  • appendiceal histoplasmosis
  • appendiceal helminthiasis
    • pinworms
    • appendiceal schistosomiasis
    • Strongyloides stercoralis

 dysimmunity

• Crohn appendicitis
• appendiceal ulcerous colitis

 appendiceal vasculitis

• appendiceal periarteritis nodosa
• appendiceal Schönlein-Henoch purpura

Videos

References

 Lamps LW. Appendicitis and infections of the appendix. Semin Diagn Pathol. 2004 May;21(2):86-97. PMID: 15807469