| Abscess |
| Appendicitis |
| Colon cancer or metastasis |
| Crohn's ileitis |
| Ectopic pregnancy |
| Gallbladder disease |
| Ileitis caused by infection with Yersinia, Campylobacter, or Salmonella |
| Left- or right-sided diverticulitis |
| Mesenteric adenitis |
| Mesenteric panniculitis |
| Metastases to the omentum |
| Ovarian torsion |
| Pelvic inflammatory disease |
| Ruptured or hemorrhagic ovarian cyst |
| Segmental omental infarction |
| Urachal cyst |
