Correct!
Answer: 4. Thoracic CT scan
Thoracic CT (Figures 3-6 below) were obtained to evaluate the finding seen on chest radiography. What is the main finding on the thoracic CT?
Figure 3. Axial thoracic CT scan
Figure 4. Movie of axial thoracic CT scan
Figure 5. Movie of coronal thoracic CT scan
Figure 6. Volume rendering of thoracic CT scan.
The thoracic CT demonstrates a circumscribed nodule in the left lower that shows a branching configuration more inferiorly. Distal to the nodule, there is extensive hyperlucency throughout the left lower lobe, representing mosaic perfusion due to air trapping
What is the most likely diagnosis?