Imaging Case of the Week 335 Answer

The AP chest x-ray shows right middle lobe consolidation. There is partial silhouetting of the right heart border.

The lateral chest x-ray has opacity superimposed on the heart, bordered by the horizontal and the oblique fissures.

Causes of right heart silhouetting on a frontal chest x-ray are:

Right middle lobe consolidation.

Right middle lobe collapse.

Pectus excavatum.

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