Clinical Report: When to Choose MRN Over Ultrasound

Overview

Magnetic resonance neurography (MRN) demonstrates superior diagnostic value compared to high-resolution ultrasound (HRUS) in detecting upper-extremity peripheral neuropathies, particularly in complex cases, as evidenced by specific metrics such as odds ratios. This study highlights the importance of lesion topography in determining the choice of imaging modality.

Background

Upper-extremity peripheral neuropathies are common and can significantly impact patient quality of life. Accurate diagnosis is crucial for effective management, and advanced imaging techniques like MRN and HRUS play a vital role in this process. Understanding when to utilize each modality can enhance diagnostic accuracy and patient outcomes.

Data Highlights

Key Findings

• MRN provided additional diagnostic value in 94.9% of cases compared to HRUS.
• Proximal-only lesions had 5.72 times the odds of added diagnostic value from MRN.
• Multi-anatomical-region involvement favored MRN with an odds ratio of 1.81.
• Clinical symptoms were less predictive of MRN value than lesion anatomy.
• HRUS was primarily useful for superficial focal lesions and dynamic assessments, but its effectiveness is highly operator-dependent.

Clinical Implications

Clinicians should consider MRN as the preferred imaging modality for complex upper-extremity neuropathies, especially when proximal lesions or multi-nerve involvement is suspected. HRUS may serve as a complementary tool in specific scenarios, particularly for superficial lesions, but its performance can vary significantly based on the operator's skill.

Conclusion

The findings support a tailored imaging approach, favoring MRN in complex cases while recognizing the utility of HRUS in certain contexts. Further studies are needed to validate these results across broader patient populations and different clinical settings.

Related Resources & Content

1. Brunnée M., European Radiology, 2026 -- High-resolution ultrasound vs. MR neurography in upper extremity neuropathies: exploratory analysis of perceived additional diagnostic value in routine clinical practice
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