Complete White-Out

‘Complete White Out’ on the CXR has a limited number of causes.
The differential diagnosis can be shortened further with one simple observation - the position of the trachea.
Is it central, pulled or pushed from the side of opacification?
Pulled (this case):
-Pneumonectomy
-Total Lung Collapse
-Pulmonary Agenesis
Central:
-Consolidation
-Mesothelioma
Pushed:
-Pleural effusion
-Diphragmatic hernia
CT confirmed total collapse secondary to a T4N3M1 lung tumour.
References:
1. Aids to Radiological Diagnosis, Chapman & Nakielny.
2. CXR Made Easy, Corne.
Credit: Dr Ian Bickle
http://www.radpod.org