Is Intestinal Ultrasound as Accurate as MRI in Crohn’s?

Managing inflammatory bowel disease requires accurate and repeat assessments of bowel inflammation. Currently, clinicians frequently rely on magnetic resonance imaging (MRI) to monitor luminal activity. However, the role of intestinal ultrasound Crohn’s disease monitoring is rapidly expanding. This is because ultrasound is non-invasive, cost-effective, and highly accessible. Specifically, a recent landmark study evaluated the clinical utility of small intestinal contrast ultrasonography (SICUS) compared to MRI.

How Intestinal Ultrasound Crohn’s Disease Scoring Matches MRI

In this prospective investigation, researchers analyzed 504 paired concurrent SICUS and MRI scans in Crohn’s disease patients. Subsequently, the team assessed correlations between various ultrasound scores and the simplified magnetic resonance index of activity (sMaRIA). Consequently, the results demonstrated that all ultrasound indices significantly correlated with sMaRIA. Moreover, these ultrasound scores showed a strong relationship with C-reactive protein levels. Therefore, clinicians can confidently use ultrasound to track systemic inflammation.

Clinical Diagnostic Performance of SICUS

Furthermore, the researchers performed receiver operating characteristic (ROC) analyses to assess diagnostic accuracy. Specifically, they evaluated how well ultrasound scores identified active mucosal inflammation compared to sMaRIA thresholds. As a result, SICUS scores displayed high diagnostic performance in detecting active luminal disease. In addition, DeLong’s test confirmed robust and comparable discriminative capabilities across different ultrasound indices. Thus, this imaging method provides a reliable alternative for routine clinical monitoring. Meanwhile, it avoids the high cost and discomfort associated with repeated MRI enterography scans.

Relevance to Clinical Practice in India

In India, access to magnetic resonance enterography is often limited by high costs and availability. However, a major prospective study, the CACTUS-CD trial, was conducted at the Asian Institute of Gastroenterology in Hyderabad. This trial confirmed that contrast ultrasound has excellent sensitivity and specificity for detecting small bowel lesions. Therefore, incorporating contrast ultrasound into standard care can greatly optimize Crohn’s disease management across India. Additionally, this approach minimizes radiation exposure and eliminates the need for intense bowel preparation.

Frequently Asked Questions

Q1: What is the main clinical advantage of small intestinal contrast ultrasonography (SICUS)?

SICUS offers a non-invasive, radiation-free, and cost-effective method to evaluate small bowel Crohn’s disease. Furthermore, it provides real-time visualization of bowel wall thickness and complications without requiring intense patient preparation.

Q2: How closely do intestinal ultrasound scores correlate with MRI indexes?

Recent clinical evidence demonstrates that ultrasound scores correlate significantly with the simplified magnetic resonance index of activity (sMaRIA). Consequently, ultrasound serves as a highly reliable substitute for tracking active mucosal inflammation.

Q3: Is SICUS feasible for routine use in Indian clinical settings?

Yes, SICUS is highly feasible and practical for routine use in India. Specifically, Indian studies like the CACTUS-CD trial demonstrate its high diagnostic accuracy and clinical utility in high-volume tertiary care centers.

References

1. Su J et al. Correlation between small intestinal contrast ultrasonography and magnetic resonance imaging scoring systems in Crohn’s disease. Eur Radiol. 2026 Jun 11. doi: 10.1007/s00330-026-12679-1. PMID: 42274753.
2. Pal P et al. Correlation and Assessment of Small Bowel Lesions Using Cross-Sectional Imaging Techniques Compared With Small Intestinal Contrast Ultrasonography in Known Crohn’s Disease (the CACTUS-CD Study): A Paired, Prospective, Confirmatory Study. Am J Gastroenterol. 2025 Sep 29. doi: 10.14309/ajg.0000000000003776. PMID: 41020653.
3. Losurdo G et al. Small Intestinal Contrast Ultrasonography (SICUS) in Crohn’s Disease: Systematic Review and Meta-Analysis. J Clin Med. 2023 Dec 15;12(24):7714. doi: 10.3390/jcm12247714. PMID: 38137783.