. The American journal of roentgenology, radium therapy and nuclear medicine . nhardly be overestimated, because there isa vast difference in the prognosis of a caseshowing a localized destruction of lungtissue and one showing localized collectionof air between the pleurae. Our inabilityor failure properly to interpret shadowsresulting from a localized pneumothorax isundoubtedly the explanation of many of interesting to observe that one could proph-esy from certain roentgen plates wherea localized pneumothorax would be likelyto develop owing to the superficiality ofthe lesion. In making a diff
. The American journal of roentgenology, radium therapy and nuclear medicine . nhardly be overestimated, because there isa vast difference in the prognosis of a caseshowing a localized destruction of lungtissue and one showing localized collectionof air between the pleurae. Our inabilityor failure properly to interpret shadowsresulting from a localized pneumothorax isundoubtedly the explanation of many of interesting to observe that one could proph-esy from certain roentgen plates wherea localized pneumothorax would be likelyto develop owing to the superficiality ofthe lesion. In making a differential diagnosis betweencavity and localized pneumothorax, thereare several aids. In the first place, the out-line of the localized area of decreased den-sity is irregular both as to contour anddensity, and it shades off gradually into thesurrounding lung tissue, and practicallyall of the normal lung structure is observedthroughout the area. One can also beguided in the correct interpretation ofshadows by the pathology presented inother portions of the chest; for instance. *4 *4 Fig. 3. Two Large Air Pockets in the Upper RightLung; One in Upper Left. The lower shadow ON THE right SIDE IS INTERLOBAR. the differences in the roentgenological andphysical diagnoses of chest conditions. Localized air pockets are observed inboth the peribronchial and parenchymaltypes of tuberculosis, the greater numberbeing seen in peribronchial infection. Thedevelopment of collections of air depends,first, upon a superficial involvement of lungtissue, the pathology either being inter-lobar or occurring in the parietal portionsof the lung tissue. First, there is a pleuritiswith or without fluid, and then an ulcera-tion or rupture of the lung tissue, so thatair escapes into the area of pleuritis. It was
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