Pyogenic sacroiliitis and pyomyositis in a patient with systemic lupus erythematous.

[pyomyositis]

Pyogenic sacroiliitis and pyomyositis are uncommon infectious diseases and their diagnoses are often delayed . They are typically seen in children and young adults and are rare in middle -aged people especially in those affected by rheumatic diseases . We present the first case of a Staphylococcus aureus related pyogenic sacroiliitis associated with iliacus and gluteal pyomyositis occurring in a patient with systemic lupus erythematosus . Antibiotic treatment was administered for a total of 6 weeks with a total recovery . Pyogenic sacroiliitis and pyomyositis , although remaining rare events , should be remembered as severe complications in immunosuppressed patients with inflammatory diseases . Early clinical suspicion , imaging diagnosis , and adequate therapy are decisive for the satisfactory outcome .