Correct!
2. The frontal chest radiograph shows a diffuse linear, interstitial pattern

The frontal chest radiograph shows a perihilar and infrahilar predominant linear pattern of interstitial thickening. The “lines’ represent interlobular septal thickening. The initial working diagnosis for the patient’s presentation was hydrostatic pulmonary edema, but the patient did not clinically respond to heart failure treatment. Therefore, the patient subsequently underwent thoracic CT (Figure 2).

Figure 2. Thoracic CT shown in selected lung windows (Panels A-D) and soft tissue windows (Panels E-H). Click here for a movie of the CT scan

Regarding the thoracic CT, which of the following statements is most accurate?

1. The thoracic CT shows a diffuse infiltrative abnormality involving both the pulmonary parenchyma and mediastinal soft tissues
2. The thoracic CT shows a diffuse, small nodular abnormality of the lung parenchyma accompanied by hila and mediastinal lymphadenopathy
3. The thoracic CT shows diffuse interstitial thickening with architectural distortion accompanied by hilar and mediastinal lymphadenopathy
4. The thoracic CT shows multifocal nodular pulmonary parenchymal consolidation accompanied by mediastinal hematoma
5. The thoracic CT shows inhomogeneous lung opacity consisting of areas of ground-glass opacity and mosaic perfusion, accompanied by mediastinal fibrous tissue

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