CTICasesDiaphragm Crus Myositis
Imaging findings
MRI of the chest/abdomen shows focal, asymmetric enlargement, muscle thickening, and high T2/STIR signal (edema) of the right hemidiaphragm crus, demonstrating patchy late gadolinium enhancement. The patient had a history of inclusion body myositis.
Key takeaways
Involvement of the diaphragmatic crura can occur in systemic inflammatory myopathies, such as inclusion body myositis or polymyositis. On imaging, this manifests as asymmetric crus thickening and edema, which must be distinguished from diaphragmatic neoplasms or normal variants.
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