Manual of pathological anatomy . e the precursor of tuberculosis, and sometimes no antecedent disease is dis-FiG. 111. coverable. In the lung, however, miliary tuber-cle, thongh generallydistributed, may occuras the sequel of diseasein the same organ ; acavity or mass of degene-rated matter being foundat one apex (forinstance),while one or both lungsare studded with miliarytubercles. The inter-vening tissue is oftenquite unaltered, some-times extremely hyper-pemic, though crepitantand otherwise natural,and, less frequently,actually pneumonic. This mode of occurrence of miliary tuberclemay ther
Manual of pathological anatomy . e the precursor of tuberculosis, and sometimes no antecedent disease is dis-FiG. 111. coverable. In the lung, however, miliary tuber-cle, thongh generallydistributed, may occuras the sequel of diseasein the same organ ; acavity or mass of degene-rated matter being foundat one apex (forinstance),while one or both lungsare studded with miliarytubercles. The inter-vening tissue is oftenquite unaltered, some-times extremely hyper-pemic, though crepitantand otherwise natural,and, less frequently,actually pneumonic. This mode of occurrence of miliary tuberclemay therefore be an accompaniment of phthisis, but is not neces-sarily so. On the other hand, the local occurrence of miliary tubercle inthe lung is always in combination with some form of phthisis. Wemay find scattered tubercles surrounding a large cavity, or im-bedded in masses of grey fibroid tissue, or mingled in variousproportions with destructive or indurative change, as will be shownin speaking of the different forms of Miliary tubercle, scattered throughout the xduI-monary tissue, forming translucent, greyish, andcircular points of the size of pins heads. PEEI-BEONCHIAL GRANULATIONS. These bodies have very often been mistaken for tubercles in acertain stage of retrogressive change. They are hard dark greynodules, with a yellowish centre, the latter having often beenregarded as a degenerated portion of the tubercle. Close examina-tion, however, shows that this yellow centre is really a perfora-tion, and represents the cross section of a small bronchial tube, thethickened walls of which cut across, with some surrounding con-solidated tissue, constitute the nodule. • The hollow of the tubecontains either ordinary inflammatory products, mucus, pus, &c.,or more generally the same products which have already under-gone degenerative decay, or caseation. These products may com-pletely fill up the tube. More information is in some cases obtainedrespecting the structure of t
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