List eight causes of multiple small bowel filling defects.

1. Lymphoid hyperplasia
2. Metastasis (e.g., melanoma, breast cancer, bronchial tumor, gastrointestinal tumor)
3. Lymphoma
4. Leiomyoma (usually solitary)
5. Neurofibroma
6. Polyposis syndrome (e.g., Peutz-Jegher syndrome, Cronkhite-Canada syndrome, Gardener’s syndrome)
7. Foreign body
8. Carcinoid tumor (usually solitary)