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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