266 ACTINOMYCOSIS 
In the lungs. The lesions in the lungs vary. They may consist 
of firm, somewhat yellowish nodules which eventually become cal- 
careous in their center and vary in size from mere specks to that of a 
pea. This form is spoken of as miliary actinomycosis. In the second 
form the actinomycotic foci soften and become filled with a gray 
muco-purulent fluid. The lesion may spread to the pleurz and even 
reach to the surface of the body by penetrating through the thoracic 
Fic. 62. ACTINOMYCOTIC GROWTH (a) IN THE 
TRACHEA OF A COW. 
wall. The bronchial 
glands and the mucosa of 
the air passages may also 
become affected. The 
trachea may be the seat of 
actinomycotic growths. 
In other organs. Ac- 
tinomycosis has been 
reported rarely as attack- 
ing the udder, spermatic 
cord, brain, spleen, liver, 
muscle, diaphragm, peri- 
toneum, inguinal glands, 
vagina, uterus and cer- 
vical vertebrae. Jcest 
has reported a case in the 
kidneys of swine. Acti- 
nomycotic peritonitis has 
been found in cattle. 
This consists of nodules 
scattered more or less 
thickly over the serous 
membrane. 
Assmann has recently 
summarized the litera- 
ture on the dissemination 
of the lesions and has 
concluded that general- 
ized actinomycosis is not 
rare in occurrence. He 
gives a detailed descrip- 
tion of eleven cases in 
cattle and hogs. 
