434 



THE CIRCULATORY SYSTEM. 



Sometimes sarcomatous and carcinomatous tumors in different parts 

 of the body are accompanied by the formation of thrombi in the heart 



FIG. 330. THROMBUS FORMED OVER THE ROUGHENED EDGE OK THE MITRAL VALVE. , 



cavities, which are composed partly of coagulated blood, partly of tis- 

 sue like that of the primary tumor. 



DEGENERATION. 



Albuminous Degeneration. (Parenchymatous Degeneration.) This le- 

 sion frequently occurs in diphtheria, J typhoid and typhus fever, pyaemia, 

 erysipelas, and other infectious diseases, as a result of burns, and under a 

 variety of other conditions. It is characterized by the presence in the 

 muscle fibres of the heart of greater or less numbers of albuminous gran- 

 ules of various sizes, most of them very small. They are not as refractile 

 as fat droplets, and are insoluble in ether, while swelling up and be- 

 coming almost invisible under 

 the influence of acetic acid. 

 Sometimes they are so abun- 

 dant as to conceal the stria- 

 tions of the fibres. The de- 

 generation is usually quite uni- 

 formly diffused through the 

 heart, whose walls are softer 

 than normal and of a grayish 

 color. This lesion may be as- 

 sociated with or followed by 

 fatty degeneration. 



Fatty Degeneration of the 



Heart Muscle. This consists in the transformation of portions of the mus- 

 cle fibres of the heart into fat, " which collects in the fibres in larger and 

 smaller droplets, sometimes few in number, sometimes so abundant as 



FIG. 331. FATTY DEGENERATION OF HEART MUSCLE. 



1 See reference, p. 



1 See in this connection, p. 80. 



