Table 1: Causes of Acute Appendicitis. Infectious etiologies can cause acute appendicitis by direct luminal obstruction, or indirectly through enlargement of lymphoid tissues [58-60].
| Causes of Acute Appendicitis | |||
| Luminal obstruction | Viral infections | Bacteria | Parasites |
| Fecalith | Measles | Salmonella | Entamoeba |
| Lymphoid hyperplasia | Adenovirus | Shigella | Strongyloides |
| Foreign body obstruction | Cytomegalovirus | Actinomyces | Enterobius vermicularis |
| Tumors: | |||
| Carcinoid | Epstein-Barr virus | Campylobacter | Schistosoma |
| Adenocarcinoma | Ascaris | ||
| Lymphoma | |||
| Serous cystadenoma | |||