List 11 causes of real or apparent separation of bowel loops.

Intrinsic causes
1. Thickened bowel wall
2. Hemorrhage
3. Ischemia
4. Neoplasm (e.g., lymphoma)
5. Inflammation (e.g., Crohn's disease, Whipple's disease, tuberculosis)
Extrinsic causes
6. Ascites (e.g., as a result of liver disease, peritonitis, peritoneal carcinomatosis)
7. Extrinsic neoplasia (e.g., lymphoma, metastatic lesions)
8. Endometriosis
9. Abscess
10. Desmoplastic processes (especially carcinoid)
11. Mesenteric lipomatosis