Myopathies: Radiologist's Essential Tips for Clinical, Pathologic, and Imaging Findings.

Area of Science:

• Neurology
• Radiology
• Genetics

Background:

• Myopathies encompass a range of skeletal muscle disorders with hereditary or acquired origins.
• Symptoms include muscle weakness and atrophy, with diagnosis complicated by diverse causes.

Purpose of the Study:

• To review current diagnostic approaches for myopathies.
• To emphasize the role of imaging and pathology in differential diagnosis and patient management.

Main Methods:

• Genetic testing for hereditary myopathies.
• Electromyography and autoantibody testing for specific myositides.
• Muscle MRI for detecting fat replacement, edema, and inflammation.
• Muscle biopsy for pathological analysis of structural changes.
• Utilizing imaging modalities like US and PET/CT.

Main Results:

• Distinct MRI patterns aid in diagnosing congenital myopathies (e.g., RYR1-related) and muscular dystrophies (e.g., dystrophinopathies, myotonic dystrophy type 1).
• Limb-girdle muscular dystrophy subtypes show specific imaging patterns.
• Metabolic and mitochondrial myopathies require integrated biochemical, genetic, and biopsy analysis.
• Idiopathic inflammatory myopathies present unique imaging characteristics.

Conclusions:

• Accurate myopathy diagnosis requires integrating clinical, genetic, imaging, and pathological findings.
• Radiologists play a crucial role in interpreting these findings for optimal patient care.
• Advancements in diagnostic techniques promise improved management of myopathies.