Which of the following findings on the chest radiograph is considered a secondary sign of emphysema?

Question

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Flattening of the diaphragm is considered a secondary sign of emphysema, as the lungs lose elasticity and the diaphragm flattens out due to the increased pressure in the chest cavity caused by the enlarged and overinflated lungs. Widening of the cardiac shadow may be a sign of cardiomegaly or heart failure, narrowing of the space between the ribs can be seen in patients with interstitial lung disease, and blunting of the costophrenic angle may indicate pleural effusion or pneumonia.

Which of the Following Findings on the Chest Radiograph Is