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[A case of pyomyositis following influenza virus infection]
Masashi Kohno1, Yuzo Koike, Nobumasa Hojo
1First Department of Internal Medicine, Ehime University, School of Medicine.
Abstract:
A 45-year-old man visited the first hospital complained of high fever on January 2003. He was diagnosed as having Influenza virus type A infection and prescribed of Oseltamivir. He was afebrile next day, but severe myalgia of neck, shoulder, lumbar region and right femoral region was appeared. His illness was considered as polymyalgia rheumatica and started of oral steroid therapy. His symptom was deteriorated and transferred to our hospital. Echography, Ga scintigraphy, computed tomography and magnetic resonance imaging revealed the multiple abscesses and the diagnosis of pyomyositis was made. Pyomyositis following Influenza virus infection must be considered as a differential diagnosis of myalgia after Influenza virus infection.
Insights
Severe muscle pain after influenza A infection may indicate pyomyositis, a serious condition requiring prompt diagnosis. This case highlights the importance of considering pyomyositis in patients with persistent myalgia post-influenza.
Area of Science:
- Infectious Diseases
- Rheumatology
- Medical Imaging
Background:
- Influenza virus type A infection can present with diverse symptoms beyond respiratory illness.
- Myalgia is a common complaint following influenza, often self-limiting.
- Polymyalgia rheumatica is a potential diagnosis for severe, widespread muscle pain.
Observation:
- A 45-year-old male developed severe myalgia in multiple regions after influenza A treatment.
- Initial diagnosis of polymyalgia rheumatica with steroid therapy did not resolve symptoms.
- Advanced imaging revealed multiple abscesses, indicating pyomyositis.
Findings:
- The patient was diagnosed with pyomyositis, a bacterial infection of the muscle.
- Pyomyositis occurred as a complication following influenza virus infection.
- Diagnostic imaging modalities like ultrasound, Ga scintigraphy, CT, and MRI were crucial for identifying abscesses.
Implications:
- Pyomyositis should be considered in the differential diagnosis of severe myalgia after influenza infection.
- Early recognition and appropriate treatment of pyomyositis are critical to prevent complications.
- This case underscores the importance of a broad diagnostic approach for post-viral myalgia.