Muscle MRI Pattern in Dysferlinopathy and its Correlation with Dysferlin Gait.

Area of Science:

• Neurology
• Medical Imaging
• Genetics

Background:

• Dysferlinopathy, a group of muscular dystrophies, exhibits characteristic patterns on Magnetic Resonance Imaging (MRI).
• Understanding these patterns is crucial for diagnosis and monitoring disease progression.

Purpose of the Study:

• To investigate lower limb muscle MRI characteristics in limb girdle muscular dystrophy (LGMD)-R2 phenotypes.
• To correlate these MRI findings with patient demographics, disease duration, functional status, and gait patterns.

Main Methods:

• Muscle MRI of the lower limbs was performed on 40 genetically or biopsy-proven dysferlinopathy cases.
• Fatty infiltration and edema patterns were analyzed.
• Spearman's correlation assessed relationships between MRI findings and clinical/demographic data.

Main Results:

• The long head of the biceps femoris showed the most severe involvement.
• Distinct MRI patterns were observed across different dysferlinopathy phenotypes (LGMD-R2, Miyoshi myopathy, proximodistal).
• Muscle Dystrophy Functional Rating Scale (MDFRS) mobility and illness duration correlated with MRI findings.

Conclusions:

• Muscle involvement in dysferlinopathy varies significantly by phenotype.
• MRI findings correlate with gait abnormalities, particularly in the proximodistal (PD) phenotype.
• Muscle MRI serves as a potential imaging biomarker for assessing disease severity and evolution in dysferlinopathy.