Consensus Guidelines from ESGAR on MRI Use in Primary Sclerosing Cholangitis

Overview

The ESGAR working group has developed consensus guidelines to standardize MRI acquisition, interpretation, and reporting in patients with suspected or diagnosed large-duct primary sclerosing cholangitis (PSC). These guidelines emphasize the role of MR imaging with MRCP as the preferred non-invasive diagnostic and follow-up modality, replacing ERCP in many cases.

Background

Primary sclerosing cholangitis is a chronic cholestatic liver disease characterized by progressive inflammation and fibrosis of the bile ducts, leading to liver failure. It predominantly affects men around 41 years of age and involves both intra- and extrahepatic bile ducts. While ERCP was historically the diagnostic gold standard, MR imaging with MRCP is now recommended due to its non-invasive nature and ability to visualize bile ducts proximal to strictures without radiation exposure. Despite advances, there remains a need to standardize MRI protocols and reporting to improve diagnostic accuracy and patient management.

Data Highlights

PSC incidence ranges from 0 to 1.3 cases per 100,000 individuals annually, with a male predominance of 60% and mean diagnosis age of 41 years. Involvement patterns include intrahepatic ducts only (15–25%), extrahepatic ducts only (5–10%), or both. The ESGAR consensus was developed by a multinational panel of 12 experts through a Delphi process reviewing literature from 2000 to 2021.

Key Findings

• MR imaging with MRCP is the recommended first-line imaging modality for diagnosis and follow-up of PSC, replacing ERCP due to its non-invasive nature and comprehensive biliary visualization.
• Large-duct PSC can be diagnosed reliably with imaging alone, whereas small-duct PSC requires liver biopsy due to near-normal imaging findings.
• The ESGAR guidelines provide standardized MRI acquisition protocols, including patient preparation, magnetic field strength, sequence selection, and use of contrast agents.
• Structured reporting templates are proposed to enhance communication between radiologists and clinicians and improve care quality.
• Consensus was achieved through a rigorous Delphi process involving expert review of international literature and grading of evidence quality.
• MRCP allows evaluation of bile ducts proximal to severe strictures that ERCP may not opacify, reducing endoscopic complications.

Clinical Implications

Clinicians should adopt MR imaging with MRCP as the primary diagnostic and monitoring tool for PSC to reduce invasive procedures and radiation exposure. Utilizing standardized MRI protocols and structured reporting as recommended by ESGAR can improve diagnostic consistency and facilitate multidisciplinary management. Awareness of the imaging distinctions between large-duct and small-duct PSC is essential for appropriate diagnostic pathways.

Conclusion

The ESGAR consensus guidelines establish MRI with MRCP as the cornerstone imaging modality for PSC, providing standardized protocols and reporting frameworks to optimize diagnosis and patient care. These recommendations support a shift away from invasive ERCP towards safer, non-invasive imaging strategies.

References

1. ESGAR Working Group Consensus 2024 -- MRI Utilization in Primary Sclerosing Cholangitis