Purulent infection within individual skeletal muscle groups usually involving abscess formation
MRI is the recommended imaging modality for establishing the diagnosis of pyomyositis; CT and ultrasound may also be of utility.
Culture of blood and abscess material should be obtained.
In the case of abscess presence, drainage is critical for optimal therapy.
S. aureus most commonly
Clostridial myonecrosis - Clostridia spp (esp C. perfringens)
Group A streptococcal myonecrosis