Represents a stenosed featureless colon.
The differential diagnosis for this includes:
1) Long standing (burnt out) ulcerative colitis
2) Granulomatous colitis
3) Unused bowel (bypassed colon with ileostomy)
4) Cathartic bowel (rare - usually right colon, spares rectum)
5) Colonic amyloidosis
6) Scleroderma