Pneumatocele

• Etiology: transient collection of interstitial air due to staphlococcus pneumonia (necrotic bronchi), chest trauma, positive pressure ventilation, hydrocarbon ingestion
• Imaging: has thin wall, usually no air-fluid level, occurs later in infection
• DDX: abscess
  — Abscess appears earlier in infection, has thick irregular walls, lasts long time
  — Pneumatocoele occurs later in infection, has thin wall, usually no air fluid level

Cases of Pneumatocele