520 



THE RESPIRATORY SYSTEM. 



is often difficult to determine in many cases of interstitial inflammation 

 of the lungs whether the lesion be syphilitic or not. l 



TUMORS. 



Fibroma and osteoma are rare. Enchondroma may occur as a primary 

 tumor originating in the cartilages of the bronchi. Sarcoma is not 



common and is usually sec- 

 ondary. " Lymphoma " may 

 develop in the lungs in leu- 

 kaemia and pseudo-leukreniia. 

 Endothelioma is of occasional 

 occurrence in the lung and 

 following the subpleural 

 lymph-vessels may form a 

 reticular raised white net- 

 work on the surface of the 

 lung (Figs. 300 and 301). 

 Adenoma as a primary tumor 

 is rare. Primary carcinoma 

 of the lung, originating in 

 the bronchi, is of occasional 

 occurrence. 2 It may be as- 

 sociated with exudative 

 pneumonia and involve large 

 portions of the lungs as 

 well as the pleura. Second- 

 ary carcinoma of the lung 

 is not infrequent. The 

 malignant growths in the 

 lung may occur as circum- 

 scribed nodular masses, dis- 

 placing the lung tissue (Fig. 

 302), or they may infiltrate 

 the lung, often following the 

 bronchi and larger blood- 

 vessels. The cells of such 

 tumors often grow into and 

 fill up the air spaces of the 

 lung, over large areas, without immediate involvement of their walls." 

 Dermoid cysts have been found in the lung. 



1 For recent bibliography of pulmonary syphilis consult Flockemann, Centralbl. f. 

 Path, und path. Anat., Bd. x., p. 449, 1899. 



2 See Passler, Virch. Arch., Bd. cxlv., p. 191, 1896, bibliography. 



3 For a consideration of the diagnosis of malignant tumors of the lung consult Adler, 

 "New York Medical Journal, February 8th and 15th, 1896, bibliography. 



FIG. 303. SECONDARY CARCINOMA OF THE LCNG. 



The primary tumor involved the gall ducts, liver, and 

 pancreas. The inetastatic tumors in the lung were in 

 part white, in part dark red from interstitial haemor- 

 rhage. 



