Pneumonia that leads to pneumatoceles in pediatric patients is most commonly caused by which organism?

• A. Staphylococcus aureus
• B. Streptococcus pneumoniae
• C. Mycoplasma pneumoniae
• D. Haemophilus influenzae

Answer: (A)

Pneumatoceles in children come from a necrotizing infection caused by Staphylococcus aureus. The bacteria can destroy lung tissue, creating thin-walled air-filled spaces that show up on imaging during or after a Staph pneumonia, especially after a recent viral illness that sets up a bacterial superinfection. This pattern is typical for pediatric Staphylococcus aureus pneumonia, while Streptococcus pneumoniae usually causes lobar consolidation without pneumatoceles; Mycoplasma pneumoniae tends to produce a more diffuse interstitial process; Haemophilus influenzae often causes bronchopneumonia without cavitation. These pneumatoceles can occasionally rupture, leading to pneumothorax, but many resolve with time and supportive care. Treat with antibiotics active against Staphylococcus aureus, including MRSA if indicated by local prevalence and risk factors.