CTICasesGroup A Streptococcal Necrotizing Pneumonia
Imaging findings
Chest radiograph and CT show a large area of consolidation in the right upper lobe with bulging of the minor fissure. CT shows internal necrosis, cavitation, and mucus debris in the airways. The patient rapidly developed septic shock and purpura fulminans, with blood cultures growing Streptococcus pyogenes.
Key takeaways
Group A Streptococcus (Streptococcus pyogenes) is a rare but highly aggressive cause of community-acquired pneumonia, often occurring in patients with a history of immunodeficiency, alcohol abuse, or viral infections. It is characterized by rapid progression, tissue necrosis, cavitation, and a high incidence of septic shock, empyema, and purpura fulminans.
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