Bilateral upper extremity myositis after COVID-19 vaccination

Area of Science:

• Immunology
• Radiology
• Pathology

Background:

• Adverse reactions following vaccination are typically mild and transient.
• Myositis, or muscle inflammation, is a less common but recognized post-vaccination complication.

Observation:

• A case of bilateral shoulder and arm myositis occurred after COVID-19 vaccination.
• The patient presented with significant muscle swelling.

Findings:

• Imaging studies, including MRI and ultrasound, revealed extensive bilateral muscle edema.
• These findings helped exclude infectious or neoplastic etiologies.

Implications:

• This case highlights the importance of recognizing myositis as a potential post-COVID-19 vaccination adverse event.
• Radiological assessment is key to differentiating vaccine-induced myositis from other serious conditions like infection or tumors.