Distinct muscle imaging patterns in myofibrillar myopathies

Area of Science:

• Neurology
• Radiology
• Genetics

Background:

• Myofibrillar myopathies (MFM) are a group of genetically heterogeneous muscle disorders.
• Accurate differentiation of MFM subtypes is crucial for appropriate patient management and genetic counseling.
• Muscle imaging plays a role in diagnosing and characterizing neuromuscular diseases.

Purpose of the Study:

• To compare muscle imaging findings across different subtypes of myofibrillar myopathies (MFM).
• To identify characteristic muscle alteration patterns that can help distinguish between MFM subtypes.
• To assess the utility of imaging in guiding genetic analysis for MFM.

Main Methods:

• Retrospective and prospective analysis of muscle imaging and clinical data from 46 MFM patients.
• Evaluation included patients with desminopathy, myotilinopathy, filaminopathy, alphaB-crystallinopathy, and ZASPopathy.
• Specific muscle groups were analyzed for differential involvement patterns.

Main Results:

• Distinct imaging patterns were observed for desminopathy, myotilinopathy, and filaminopathy.
• Desminopathy showed specific semitendinosus and peroneal muscle involvement.
• Myotilinopathy and filaminopathy exhibited characteristic patterns in thigh and calf muscles, with differing age of onset and weakness distribution.

Conclusions:

• Muscle imaging findings, when combined with clinical data, can effectively differentiate MFM subtypes.
• This approach aids in the diagnostic process and can inform the scheduling of genetic analyses.
• Identifying characteristic imaging patterns improves the diagnostic accuracy for these rare muscle disorders.