[Unclear tetraparesis under immunosupression].

We report a case of a 69-year-old man who developed tetraparesis and muscular pain under the therapy of prednisolone for several months. Diagnosis was sepsis due to pyomyositis with multiple septic pulmonary staphylococcus aureus abscesses. Antibiotic therapy with piperacillin and tazobactam resulted in a decrease of the inflammatory factors and improvement of the tetraparesis. Pyomyositis, common in tropical areas, is a suppurative infection of striated muscle. Immunodeficiency has been implicated in the development of pyomyositis in temperate climates.