Muscle MRI in patients with dysferlinopathy: pattern recognition and implications for clinical trials

Area of Science:

• Neurology
• Radiology
• Genetics

Background:

• Dysferlinopathies are genetic muscle disorders caused by mutations in the DYSF gene.
• Previous muscle imaging studies were limited in scope and lacked correlation with functional tests.

Purpose of the Study:

• To perform a large-scale muscle MRI study across the spectrum of dysferlinopathies.
• To correlate imaging findings with functional tests.
• To establish a characteristic imaging pattern for diagnostic and clinical trial purposes.

Main Methods:

• Cross-sectional T1-weighted muscle MRI data from 182 genetically confirmed dysferlinopathy patients.
• Hierarchical analysis and heatmaps to analyze muscle involvement patterns.
• Correlation of MRI findings with relevant functional tests.

Main Results:

• Muscle pathology observed in 181/182 patients.
• Gastrocnemius medialis and soleus muscles were most frequently affected.
• Increased MRI pathology correlated with longer disease duration and greater functional impairment.

Conclusions:

• A characteristic muscle MRI pattern for dysferlinopathies was identified.
• Imaging findings provide diagnostic value and insights into disease natural history.
• Identified key regions of interest for quantitative MRI in future clinical trials.