[Pyomyositis caused by Streptococcus pneumoniae in a previously healthy 20-year-old man].

Pyomyositis is a bacterial infection of the skeletal muscle usually caused by Staphylococcus aureus. This case report presents a 20-year-old man with pyomyositis caused by Streptococcus pneumoniae. Pyomyositis is a rare but potentially critical disease, and early diagnosis, drainage and use of appropriate antibiotic therapy are essential to reduce morbidity and mortality.