Anatomical Changes. 



131 



ias well as in the meninges. There is also acute hemorrhagic 

 swelling of the lymph glands and gelatinous serous infiltration 

 of the subcutaneous connective tissue, especially in the region 

 of the throat and neck. 



In the more frequent acute cases lesions in the thoracic 

 organs are constantly present. The lungs contain either small 

 or larger hepatized areas, of which the cut surface, according 

 to the duration of the disease, is either blackish-red or dark 

 brownish-red to 

 light gray, and 

 studded with mil- 

 let seed to hemp 

 seed sized pale 

 yellow granules 

 (croupous hemor- 

 rhagic or multiple 

 necrotic pneu- 

 monia; Fig. 30). 

 Some of the hepa- 

 tized areas are sur- 

 rounded by a pale 

 yellow necrotic 

 zone. In older 

 cases, however, 

 larger areas, sorae- 

 times even entire 

 lobes of the lungs, 

 are changed into a 

 mass of cheesy de- 

 tritus. The inter- 

 lobular connective 

 tissue is thickened 

 and shows a serous 

 or bloody infiltra- 

 tion as a result of 

 which the cut sur- 

 face has a mottled 

 appearance. The 

 pleura over the af- 

 fected areas of the 

 lungs is covered 

 with loose or more 

 adhesive fibrinous 

 deposits under 

 which the pleura 

 contains small 



hemorrhages or shows bloody infiltration. In the thoracic 

 cavity sero-fibrinous exudate may be present in varying quan- 

 tities (exceptionally pleurisy may occur without pneumonia). 

 A similar inflammatory process exists frequently on the 



Fig. 30. MuUiple necrotic pneumonia in swine plague, 

 (a) Congested lung tissue still containing air ; (h) brown- 

 ish-red hepatization ; (o) grayish-red hepatization ; (d) 

 dilated septum; (e) necrosis of a lobule; (f) necrotic 

 focus (center dark red, border pale yellow) ; (g) bronchus. 



