List nine causes of multiple colonic filling defects.

1. Hyperplastic polyps (90% of cases)
2. Adenomatous polyps
3. Hamartomatous polyps
4. Multiple adenocarcinomas
5. Lymphoma
6. Metastases (usually from the breast, lung, or ovary)
7. Lymphoid hyperplasia larger than 4 mm (e.g., as a result of lymphoma, Crohn’s disease, or AIDS prodrome)
8. Endometriosis
9. Foreign bodies (e.g., food, tablets, stool)