500 



TUMOES. 



more numerous than in simple myxomatous tissue. Myxoma- 

 tous tumors, especially the so-called polypoid tumors, often 

 exhibit some of the features of this type, indicating a rapid 

 growth of the tumor and its liability to recur after extirpation. 

 If the reticulum is very delicate, and 

 the inclosed plastids very small, not 

 exceeding in size the lymph-corpus- 

 cles, the type of a lympho-myeloma 

 (small globo-myeloma) is established, 

 which growth is of intense malignity. 

 Myxo-myeloma, therefore, blends with 

 the spindle-net myeloma, as well as 

 with the lympho-myeloma. (See Fig. 

 200.) 



(c) Chondro-myeloma differs from 

 chondroma in the softness of its basis- 

 substance, while the plastids may 



FIG. 199. GLOBO-MYELOMA, 

 WITH A MARKED FORMATION 

 OF BASIS-SUBSTANCE. FROM 

 THE ABDOMINAL WALL OF 

 AN ADULT. 



C, capillary blood-vessel in trans- 

 verse section ; A, artery in transverse 

 section. Magnified 600 diameters. 



exhibit the size and shape 

 of cartilage corpuscles. 

 Many of the so-called " ma- 

 lignant chondromata" prob- 

 ably are chondro-myeloma, 

 and I know this mistake to 

 have been made by good 

 pathologists. The term 

 ' i chondro - myeloma " may 

 also be applied to tumors 

 which, in a tissue showing all the features of globo-myeloma, 

 contain islands of well- developed cartilaginous tissue. 



(d) Osteo-myeloma is a term used for the designation of 

 myelomatous tumors growing in the middle of the bone, or of 



FIG. 200. MYXO-MYELOMA. RECURRENT 

 PHARYNGEAL POLYPUS. 



B, portion of myxomatous structure ; P, portion 

 of myelomatous structure ; V, large capillary blood- 

 vessel. Magnified 600 diameters. 



