Correct!
4. 1 and 3

Both thoracic CT and pulmonary function testing are appropriate for this patient. The large lung volumes suggest obstructive pulmonary disease, and both pulmonary function testing and thoracic CT are very useful for the assessment of suspected obstructive lung disease. 68Ga-citrate scintigraphy is occasionally useful for diffuse inflammatory lung disease detection, but has no role for the evaluation of obstructive lung disease.

The patient underwent unenhanced thoracic CT (Figure 4).

Figure 4. Panels A-F: Representative images from axial thoracic CT displayed in lung windows. Right: video of axial thoracic CT 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 fifth of seven panels)

1. Thoracic CT shows enlarged peripheral pulmonary arteries suggesting pulmonary hypertension
2. Thoracic CT shows multifocal cystic airway dilation
3. Thoracic CT shows smooth interlobular septal thickening suggesting increased pressure pulmonary edema
4. Thoracic CT shows extensive low attenuation throughout the lung parenchyma
5. Thoracic CTA shows segmental areas of air trapping

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