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.
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