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5. Thoracic CT shows pneumomediastinum and extensive subcutaneous emphysema

Thoracic CT shows extensive subcutaneous emphysema and pneumomediastinum. Small bilateral pneumothoraces are present, but a large left pneumothorax is not seen, nor is there a significant left pleural fluid collection. No evidence of nodular, cavitary, or cystic lung disease is seen. Extensive symmetric basal consolidation is noted bilaterally. The pneumomediastinum is predominantly seen anteriorly. No bronchiectasis is present and no definite interstitial emphysema is seen.

One day later the patient underwent repeat chest radiography (Figure 3) for worsening respiratory status.

Figure 3. Repeat frontal chest radiograph.

Which of the following best describes the chest radiographic findings for this patient? (Click on the correct answer to proceed to the sixth of eight panels)

1. The frontal chest radiograph shows developing cavitation in the lung parenchyma
2. The frontal chest radiograph shows interval worsening of bilateral consolidation and ground-glass opacity
3. The frontal chest radiograph shows intrathoracic herniation of the stomach
4. The frontal chest radiograph shows the “fallen lung” sign
5. The frontal chest radiograph shows worsening subcutaneous emphysema and pneumomediastinum
   

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