US. (a) Wall thickening without stratification and hyperecoic lumen. Regular outer margin of the loop. Mesenteric fat hypertrophy. (b) Coexistence of two patterns. Stenotic and thickened loop with preserved stratification and an adjcent segment with loss of stratification. (c) Stenotic intestinal tract characterized by marked dilatation of the bowel lumen, with thickened bowel wall. (d) Wall thickening with loss of normal stratification. Discontinuous outer margin with hypoecoic indented irregularities due to extramural findings.
