CTICasesEmpyema necessitans from Staphylococcus aureus osteomyelitis
Imaging findings
CT scan shows a left upper lobe nodule/consolidation directly eroding the adjacent first rib and extending into the anterior chest wall soft tissues, associated with local pain and swelling.
Key takeaways
Empyema necessitans is the extension of an empyema or lung infection into the chest wall. While classically caused by Actinomyces or Tuberculosis, acute pyogenic infections like Staphylococcus aureus can seed the sternoclavicular/costoclavicular joints and extend into the chest wall.
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