Intestinal Ultrasound and Its Advanced Modalities in Characterizing Strictures in Crohn's Disease

Area of Science:

• Gastroenterology
• Medical Imaging
• Pathology

Background:

• Crohn's disease (CD) strictures present with variable inflammation and chronicity.
• Accurate characterization of stricture composition is crucial for effective treatment planning.

Purpose of the Study:

• To evaluate the accuracy of intestinal ultrasound (IUS) in characterizing the composition of Crohn's disease strictures.
• To identify parameters indicative of inflammatory versus chronic strictures.

Main Methods:

• Prospective, cross-sectional study involving CD patients undergoing small bowel resection.
• Intestinal ultrasound (IUS) and contrast-enhanced ultrasound (CEUS) were performed prior to resection.
• Histological assessment of resection specimens and blinded evaluation of stricture phenotypes (inflammatory, chronic, mixed).

Main Results:

• The Stricture Score Amsterdam (SSA) was developed using IUS and CEUS parameters.
• SSA demonstrated high accuracy in differentiating inflammatory (AUROC:0.88) and chronic (AUROC:0.90) strictures.
• Good inter-observer agreement (ICC:0.73) was achieved for the SSA.

Conclusions:

• A combination of IUS and CEUS accurately differentiates inflammatory and chronic strictures in CD.
• The SSA shows potential as a diagnostic aid for treatment selection (surgical vs. medical).
• External validation of the SSA is recommended.