Tiiherciilosis. 



303 



disintegration) into soft, partly purulent, partly caseous areas of 

 very variable size. Such necrosed parts may become impregnated 

 with lime salts (especially in cattle) and eventually assume a 

 chalky, plaster-like or sandy appearance. 



Just as in chronic productive inflammation the fibr()])]astic tissue 

 is changed into a firm cicatricial mass, the proliferated connective 

 tissue cells of a tubercle are also able to assume a genuine fibro- 



Fig. 65. 

 Funguus tubercle with giant cells (without caseatiou) from the larynx of a cow. 



plastic function, particularly in the formation of a fibrillar matrix 

 and may thus give to the tubercle a firm fibrous character. 



It may therefore be appreciated that the anatomical forms of 

 tuberculosis vary considerably according to the tissue predisposition 

 in the diiTerent animal species, and the extent and duration of the 

 process. The principal forms are: miliary tuberculosis, tubercu- 

 lous ulceration, tuberculous cheesy infiltration, tuberculous cavities, 

 ■fungous granulontatons tuberculosis (or tuberculoma). 



The miliary tubercle, the earliest product of the reactive process 

 of the disease, as already stated, appears as a gray or yellowish-red 



