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In single cases purulent content in pleural cavity had lamellar character with hyperchromogenic areas of various shapes. Heterogeneous structure of pleural empyema with more chromogenic, than suspension itself, fragments with uneven contours was registered at hemopleura suppuration, when partially decayed thrombotic clots were found in purulent content.
At pyopneumothorax we detected major diffusely located achromogenic areas corresponding to a separate air beads in purulent exudate. Depending on size they had a form of both point inclusions and quite extensive neoplasms. Free air in pleural cavity caused appearance of achromogenic line above fluid content.
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