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Differences in PA versus AP projection on a chest radiograph

Case contributed by: Dr Yi-Jin Kuok

Presentation:

Motor bike accident

Patient Data:

Age: 30
Gender: Male

the superior mediastinum appears widened due to AP magnification

the heart appears enlarged - a combination of AP magnification and underinflation

there appears to be a bilateral interstitial infiltrate - also due to underinflation

same patient, repeat CXR the next day (PA projection this time)

completely normal

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