List 12 causes of a cecal filling defect.

1. Carcinoma
2. Lipoma
3. Metastasis (usually from the ovary, stomach, or colon)
4. Carcinoid tumor
5. Appendicitis
6. Appendiceal stump
7. Lipomatous ileocecal valve
8. Mucocele of appendix
9. Periappendiceal abscess
10. Diverticulitis
11. Intussusception
12. Fecal matter