TUMORS. 



519 



Myo-fibroma of the uterus is prone to fatty and calcareous 

 degeneration j the former invades both the plastids of the con- 

 nective tissue and the muscles, the latter only the connective- 

 tissue frame. Moreover, there are cases on record where an 

 original myo-fibroma has changed into a malignant myeloma, or 

 even into cancer. 



Myoma is a tumor of rare occurrence in the skin (growing in 

 the neighborhood of the nipple and in the scrotum), somewhat 

 less rare in the wall of the ossophagus, the stomach, the intes- 



FIG. 214. MYO-FIBROMA OP THE UTERUS. 



L, longitudinal bundles of smooth muscle-fibers, not distinguishable from fibrous connect- 

 ive tissue ; F, bundles of smooth muscle-fibers, cut transversely ; A, artery with a heavy 

 muscle-coat. Magnified 500 diameters. 



tines, in the wall of the urinary bladder, and in the prostate (in 

 the latter, hyperplastic myoma Virchow). 



9. NEUROMA. NERVE TUMOR. 



The term " neuroma " can be properly applied only to tumors 

 which consist entirely, or at least partially, of newly formed 

 medullated or non-medullated nerve-fibers j but it is doubtful 



