In the group of patients suffering from pleural empyema there were 54 patients with purulent exudate in a pleural cavity. In 43 patients we registered limited exudate of oval shape with paracostal localization, often along posterior or lateral surface of thorax. In 11 patients pleural empyema was of diffused character, in 6 of them pyopneumothorax was diagnosed. In 39 patients had para- and metapneumonic genesis, in 8 patients – posttraumatic, it 7 reason was not found.
The main diagnostic criterion of pleural empyema was hyperchromogenic suspension caused by purulent detritus. In the majority of cases it was spread throughout the whole volume of empyemic cavity, had high density, heterogeneous character and it could imitate a solid neoplasm. To differentiate it with a tumor a spectral-entropic analysis must be applied. There were no isochromogenic fibrinous fibers in an empyemic cavity, it was limited by thickened pleura slips (up to 8 mm) with uneven surface.
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