Correct!
5. All of the above

The tubular nature of the bilateral lower lobe opacities suggests an abnormality involving one of two anatomical elements within the thorax that normally exhibit a tubular shape- vessels or airways. Each of the above choices is related to either the pulmonary vasculature or airways, and therefore any of the choices should be considered among the differential diagnostic possibilities for the opacities on the chest radiograph.)

The patient underwent contrast-enhanced thoracic CT (Figure 2) for further characterization of the abnormalities seen at chest radiography.

Figure 3. Axial enhanced thoracic CT displayed in soft tissue (A-E) and lung windows (axial, F, sagittal, G and H).

Which of the following statements regarding this CT examination is most accurate?

1. The thoracic CT shows anomalous systemic arterial supply to the lower lobes bilaterally originating from the cranial abdominal aorta
2. The thoracic CT shows that the tubular opacities on the chest radiograph represent bronchial impaction
3. The thoracic CT shows that the tubular opacities on the chest radiograph represent dilated and tortuous peripheral pulmonary vessels
4. The thoracic CT shows that the tubular opacities on the chest radiograph represent innumerable pulmonary arteriovenous malformations
5. The thoracic CT shows that the tubular opacities on the chest radiograph are artifactual, probably created by atelectasis and superimposition of overlapping structures

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