Differentiation of Fibrotic and Inflammatory Bowel Stenosis in Crohn's Disease Using SWE
Clinical Problem
Bowel strictures may be inflammatory, fibrotic, or malignant. In inflammatory bowel disease (IBD), strictures are further classified as inflammatory and fibrostenotic. This distinction is important for selecting treatment strategy (Kamaya et al., 2022).
Role of Elastography
Bowel elastography combined with CEUS helps differentiate stricture types. The method assesses the degree of stenosis stiffness: soft strictures are most likely inflammatory, whereas a stiff segment indicates fibrostenotic disease (Kamaya et al., 2022).
EFSUMB Guidelines Data
Bowel wall may thicken in both neoplastic and inflammatory diseases, predominantly in Crohn's disease (CD). Strain elastography (SE) has been applied for clinical differentiation of fibrotic and inflammatory lesions in CD, as well as for differentiating adenoma from adenocarcinoma of the rectum. Several animal model and human tissue studies in CD conclude that stiffness is associated with the presence of fibrotic strictures (EFSUMB 2018).
Technical Limitations
Peristalsis and bowel contents add artifacts to strain imaging, making targeted SWE or SE measurements more difficult and operator-dependent (EFSUMB 2018).
Summary
| Stricture Type | Stiffness on Elastography |
|---|---|
| Inflammatory | Soft |
| Fibrostenotic | Stiff |
Frequently asked questions
What elastography sign indicates fibrotic stenosis?
A stiff bowel wall segment indicates fibrostenotic disease, whereas soft strictures are more often inflammatory (Kamaya et al., 2022).
Why is it important to distinguish these stricture types?
Determining whether a stricture is inflammatory or fibrostenotic in nature is important for selecting patient management strategy (Kamaya et al., 2022).
What method is combined with elastography for differentiation?
Bowel elastography is applied in combination with CEUS to improve diagnostic accuracy in differentiating stricture types (Kamaya et al., 2022).
What technical factors reduce the reliability of SWE/SE?
Peristalsis and bowel movement add artifacts to strain imaging, making targeted measurements more difficult and operator-dependent (EFSUMB 2018).
Are specific stiffness threshold values provided?
Specific numeric SWE thresholds are not stated in the provided fragments [clarification needed].