. Radiography and radio-therapeutics . especially among patients at middle life or later, where the ex-cess of fibrous tissueleads to very definiteperibronchial shadows,which are due entirelyto the thickening aroundthe bronchi, and arediagnostic neither oftuberculosis nor many of these casesthe thickening of thebronchus may be seenon cross-section. It frequently happens, especially on the right side of the chest, that one ormore nearly circular rings are shown. These are caused by a cross-sectionof the bronchus, where it bends nearly at right angles on its way to thedeeper part of th
. Radiography and radio-therapeutics . especially among patients at middle life or later, where the ex-cess of fibrous tissueleads to very definiteperibronchial shadows,which are due entirelyto the thickening aroundthe bronchi, and arediagnostic neither oftuberculosis nor many of these casesthe thickening of thebronchus may be seenon cross-section. It frequently happens, especially on the right side of the chest, that one ormore nearly circular rings are shown. These are caused by a cross-sectionof the bronchus, where it bends nearly at right angles on its way to thedeeper part of the lung. The radiograph in Plate LVIL, Fig. h, well illustrates the peribronchialthickening; it is from a case of malignant disease and the branchingof the brSnchi is very well seen. The patient did not suffer from phthisis,nor had she any secondary deposits of cancer at the roots of thelungs. The grosser manifestations of tuberculosis of the lung requireno lengthy description. A few radiographs will illustrate the appearancesmet Fig. 252.—Thorax of child, age about 12 years. Peribronchialthickening, with calcareous deposits in the glands at the rootsof thickening is clearly seen in the right side, and on the left side can be seen through the heart shadow, extending down to the dome of diaphragm. 296 RADIOGRAPHY Cavities may readily be shown, especially when they are large andcontain air, though the localisation of a small cavity in an area of consolida-tion is not always possible. It must be borne in mind that other conditions than tuberculosis giverise to appearances identical in every respect. Actinomycosis of the lungin the earUer stages is practically indistinguishable from a widespread tuber-culous infection. In the later stages, however, more marked changes in theformer might lead to a correct diagnosis. The nodules tend to becomecoarser than in miliary tuberculosis, and the tendency to suppurate shouldput us on guard when examining a suspicious case. I
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