Correct!
1. The frontal chest radiograph shows a new lung cavity

The presentation radiograph shows a moderately thick-walled left lower lobe cavity with poorly defined margins, entirely new since the comparison chest radiograph one month previously. No other lung nodules are evident, and no clear evidence of peribronchial or mediastinal lymph node enlargement is seen. Lung volumes appear normal, with no features to suggest fibrotic lung disease, and no evidence of cystic lung disease is seen.

The patient underwent enhanced thoracic CT (Figure 2) to further characterize the lesion found at chest radiography.

Figure 2. Panels A-F: axial enhanced thoracic CT displayed in lung windows. Right panel: video of axial enhanced thoracic CT displayed in lung windows.

Which of the following is correct regarding the description of the thoracic CT findings? (Click on the correct answer to proceed to the third of eight panels)

1. Thoracic CT confirms the chest radiographic findings and reveals additional lung nodules
2. Thoracic CT confirms the chest radiographic findings and shows no other relevant findings
3. Thoracic CT shows the left lower lobe lesion demonstrate the “waterlily” sign
4. Thoracic CT shows the left lower lobe lesion demonstrates an “air crescent” sign
5. Thoracic CT shows the left lower lobe lesion demonstrates the “reverse ground-glass halo” (“atoll”) sign

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