Answers :
What can you see on the chest radiograph ?
The patient has a pneumothorax and an air fluid level - this is a hydropneumothorax.
Now look at the CT images - what underlying abnormality is present ?
The CT shows numerous bullae and cysts. The hydropneumothorax could be due to trauma but the presence of underlying lung disease raises the possibilty of a spontaneous pneumothorax.
On the CT there is another significant abnormality - what is it ?
There is left lower lobe collapse.
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