THE RESPIRATORY SYSTEM. 



519 



SYPHILITIC PNEUMONIA. 



Persons suffering from inherited or acquired syphilis sometimes de- 

 velop inflammations of the lungs which seem to be due to the syphilitic 

 infection. The lungs may then be affected in several different ways. 



There may be well-defined large or small gummata with or without 



FIG. 300. ENDOTHELIOMA OF THE PLEURA. 

 Showing the growth of the tumor along the superficial lymph-vessels. 



interstitial and more or less exudative pneumonia. There may be a for- 

 mation of new fibrous tissue in the walls and lung tissue about the bronchi, 

 often with ulceratioii of the mucous membrane and distortion of these 

 structures. There may be, particularly in the new-born, lobular or lobar 

 hepatization, the affected region appearing reddish or gray or white. 

 This is due to a growth of new cellular tissue in the walls of the air 



FIG. 301.-ENDOTHELIOMA OF THE LUNG. 



The growth is in the subpleural lymph-vessels, which seen from the pleural surface in the fresh lung 

 formed a white raised network over a considerable portion of one lung. The lymph-vessels in the cut are 

 seen in transverse section. 



spaces and to an exudate largely of epithelial cells in the airspaces. In- 

 farctions of the lung from obliterating endarteritis may be present. It 



