Achromogenic nonlinear air signal in upper half of an abscess;
Step-like location of hyperchromogenic signals in lower part and interlayer with multiple small air bubbles at high density of purulent exudate..
An abscess inside pneumonic infiltrate or obstructive atelectasis had no achromogenic areal around itself due to weak chromogeneity of surrounding pulmonary tissue. A contour of a destruction nidus was traced along border of hyperchromogenic content of an abscess and hypochromogenic lung tissue. The main difference of an abscess with a background of pneumonia was clear achromogenic air component in a liquid content. Burst of purulent exudate into bronchi happens quite early at relatively small cavity of destruction. In obstructive atelectasis even large cavities of destruction were filled with liquid content without achromogenic inclusions, because air could not penetrate there due to complete obstruction of a bronchus by tumor.
In accordance with pathomorphological picture of an abscess, its walls are formed not earlier than V stage of a disease, so they cannot be visualized at early stages. Before this a nidus of destruction is limited by lung tissue itself with necrotic and fibrinous changes on its surface. A wall along the whole perimeter of a cavity was registered at chronic and continuous abscesses, its Biophilia tracker picture had a decisive meaning in differential diagnostics with cavitary form of lung cancer. SEA results were the most important diagnostic criteria.
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