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Hydropneumothorax is a term given to the concurrent presence of a pneumothorax as well as a hydrothorax (i.e. air and fluid) in the pleural space.


It may arise in various situations which include

Radiographic features

Plain radiographs

On an erect chest radiograph, recognition of hydropneumothorax can be rather easy - and is clasically shown as an air-fluid level. On the supine radiograph, this may be more challenging where a sharp pleural line is bordered by increased opacity lateral to it within the pleural space may sometimes suggest towards the diagnosis 3, 4

Differential diagnosis

For an air-fluid level on plain film consider

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