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Imaging spectrum of atraumatic muscle disorders: a radiologist’s guide

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Abstract

Atraumatic muscle disorders comprise a very wide range of skeletal muscle diseases, including metabolic, inflammatory, autoimmune, infectious, ischemic, and neoplastic involvement of the muscles. Therefore, one must take clinical and laboratory data into consideration to elucidate the differential diagnoses, as well as the distribution of the muscle compromise along the body—whether isolated or distributed along the body in a symmetric or asymmetrical fashion. Assessment of muscular disorders often requires imaging investigation before image-guided biopsy or more invasive procedures; therefore, radiologists should understand the advantages and limitations of imaging methods for proper lesion evaluation and be aware of the imaging features of such disorders, thus contributing to proper decision-making and good patient outcomes. In this review, we propose a systematic approach for the assessment of muscle disorders based on their main imaging presentation, dividing them into patterns that can be easily recognized.

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Correspondence to Dâmaris Versiani C. Gonçalves.

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Key points

1. Atraumatic muscle changes on imaging may have a broad range of differential diagnoses, which can be narrowed by careful assessment of the lesion distribution along the body and complementary clinical and laboratory data.

2. Muscle disorders can be assessed by a variety of imaging modalities, each method having its own strengths and limitations.

3. Muscle disorders can be divided into the following four patterns according to the main imaging features: intramuscular edema; intramuscular calcification; mass-like effect; and fat infiltration.

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Gonçalves, D.V.C., da Silva, L.N.M., Guimarães, J.B. et al. Imaging spectrum of atraumatic muscle disorders: a radiologist’s guide. Skeletal Radiol (2024). https://doi.org/10.1007/s00256-024-04659-7

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