[Non-tropical pyomyositis].

This is a report on a 51-year-old man with all the symptoms of a non-tropical pyomyositis, namely a prodromal stage with lassitude, associated with a high fever and diffuse joint and muscle pain followed by the gradual development of a full-blown invasive stage. In the suppurative stage, the extensive pus is caused by staphylococcus aureus located in the extensor muscle of the right thigh.