At free spontaneous draining the main volume of exudate was already removed through bronchi, and entered air in sufficient amounts formed large bubbles in a structure of exudate and was accumulated in superior parts of an abscess. This stage was characterized by division of a content into superior gaseous layer and inferior liquid layer. Free air in a cavity of an abscess looked like continuous achromogenic line. At major stickiness of purulent exudate, instead of continuous line we found several achromogenic nidi, located step-by-step next to each other. Liquid content occupied inferior part of an abscess, it contained achromogenic air inclusions, spread diffusely or with a layer of air bubbles.

Hypochromogenic border of a lung around clearly separated abscesses had clear and even contour. At vague bordering a contour of a purulent cavity was very uneven and serrated. Hypochromogenic line disappeared at the level of bordering hyperchromogenic area, corresponding to areas of inflamed infiltration into lung tissue. In these areas a border between exudate and lung parenchyma was vague.

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