The following results were obtained from comparative observation on roentgenological
and pathological findings of 138 surgically resected tuberculous lungs of 160
experimental animals
1) Roentgenological of pulmonary tuberculosis were classified from purely
morphological aspect according to shapes of shadows of the lesions.
2) X-ray pictures of miliary tuberculosis in infected animals seem to be influenced not
only by the characteristics of pathologic changes, namely productive process or
exudative processes, but also by the difference of pathologic changes in initial and
advanced stages in particular.
3) 68.7% of pin-point sized shadow in the X-ray pictures of dissemination type are
accompanied by central cessation necrosis and non-specific exudative peripheral
inflammation and those of bronchial dissemination type show more chronic histologic
changes than those of hematogenous dissemination type.
4) In the human specimens, the mottled shadow lesions and the patchy shadow
lesions were pathologically compared. In the former, encapsulated caseous lesions are
predomination in number(70.8%), and on the other hand, small cavity with central
softening and peripheral inflammation are predominant and fibrous porliferation is not
remarkerable in the latter.
5) In the human specimens, roentgenologically, tuberculomas of round isolated type
tend to calcify in cases in which lesion are smaller than finger tip size(1×1.2cm),but
they tend to soften in cases in which lesions are larger than those.
6) In the X-ray pictures of lobar pneumonic type in the infected animals, it is
impossible to differentiate each of the following three ; pure exudative process, lobar
exudative process with partial caseous degeneration and pure lobar casesous pneumonia.
Roentgenographic difference among them first appear only after formation of softened
cavities.
7) Thin walled cavities in roentgenograms of the human specimens indicate diminution
of peripheral inflammation and complete evacuation of caseous materials from the early
cavites.
8) In the human specimens, roentgenographical thick-walled cavities consist of 27.8%
of sclerotic cavity, 64.4% of early cavity and 7.8% of tuberculoma which are softened
and disintegrated.
They are influenced by connective tissue of cavity wall, presence or absence of
peripheral inflammation and they do not always mean sclerotic cavity.
9) In infected animals, it is characteristic that the giant cavity containing lobe tends
to enlarge, and the main cause of this is considered that the enlargement of cavity it
self and edema of tissue surrounding cavity due to sudden softening of the lesion of
caseous bronchopneumonia
10) The location of cavities which are observed in the human specimens is found in
the following order of frequency. In the right lung, the posterior segment is 34.5% and
the superior segment 7.2%. In the left lung the apico-posterior segment is 46.3%, and
the superior segment 5.4%.
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