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image
The axial CT scan
examination of the lower chest done without the use of intravenous contrast
shows a loculated left pleural effusion with air demonstrated within its
confines which indicate an infected pleural space or the presence of a
bronchopleural fistula. The arrow points to an area where there is communication
between the pleural effusion and the extrapleural space, notably in this
case the musculature of the lateral chest wall. This is radiologically
compatible with a fistula communication between the possibly infected
pleural fluid and the extrapleural space and represents an empyema neccesitans.