Loculated pleural effusion

Pleural empyema is a collection of pus in the pleural cavity caused by microorganisms, usually bacteria. Often it happens in the context of a pneumonia, injury, or chest surgery. [Source: Wikipedia ]

Synonyms
Loculated pleural effusions
Loculated pleural fluid
May Cause
Multiple pleural masses
Pleural mass
Posterior mediastinal lesion
Right anterior cardiophrenic angle lesion