. Radio-diagnosis of pleuro-pulmonary affection . appear, disappear, and become modi-fied, according to whether the cavity is filled with pus orwhether the secretions have been totally or partially emptied. Study of the complications in tuberculosis.—Lorrain hasstated that pulmonary tuberculosis is only a series of pneu-monias ; Louis that it is only a succession of pleurisies. Thereis a great deal of truth in both these affirmations. So the PULMONARY TUBERCULOSIS 137 term complication used at the beginning of this chapteris not absolutely correct. In reality the many and variedpleural and pul
. Radio-diagnosis of pleuro-pulmonary affection . appear, disappear, and become modi-fied, according to whether the cavity is filled with pus orwhether the secretions have been totally or partially emptied. Study of the complications in tuberculosis.—Lorrain hasstated that pulmonary tuberculosis is only a series of pneu-monias ; Louis that it is only a succession of pleurisies. Thereis a great deal of truth in both these affirmations. So the PULMONARY TUBERCULOSIS 137 term complication used at the beginning of this chapteris not absolutely correct. In reality the many and variedpleural and pulmonary processes that are produced in thecourse of the development of pulmonary tuberculosis are notcomplications but the sequence. They are the natural reac-tions of the lung and of the pleura against the disease, fromwhich there are a series of attacks of congestion, pneumonia,broncho-pneumonia and on the other hand, a series of at-tempts at rest and immobilization by pleural adhesions,symphyses, sclerosis, effusions, or partial Fig. 24Pneumonia on the left side with pneumonic triangle, in an advanced tuberculouscase having lesions already pronounced on the right and more questionable in theleft apex. All these different processes, some of which are very diffi-cult to determine clinically, give radioscopic pictures whichmay be sufficiently characteristic to allow of diagnosis. Attacks of congestion are usually produced in the apicalareas. They are ordinarily easy to recognize because accom-panied by rise of temperature and often by they are seen as a somewhat opaque diffuseshadow of the apex involved and if it is a question of tuber-culosis which has akeady been observed on the screen, aperceptible difference can be noticed. The opacity is con- 138 RADIO-DIAGNOSIS: LUNGS siderably more than on first examination. Sometimes theradioscope serves only as a control. It is quite different inpneiin;onia, which, when it occurs in a fully deve
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