514 



TUMOES. 



character i. e., is dark purple or bluish-red. The sinuses are 

 lined with a delicate layer of endothelia. (See Fig. 211.) 



Angioma is a common type of tumors, and in most instances 

 is congenital. The simple and lobular angioma is located either 

 in the tissue of the derma of the skin or in the subcutaneous 

 tissue, and is in the latter situation abundantly supplied with 

 fat-globules. These tumors may occupy large districts in the 

 face (the so-called " fire-mole/ 7 naevus vasculosus), or they may 

 appear in a number of smaller spots or elevations in different 

 parts of the skin. They may either remain stationary or grad- 

 ually increase in extent. Spontaneous cure is not an infrequent 



FIG. 210. LOBULAR ANGIOMA, FROM THE ORBIT OF A CHILD. 



LL, lobules composed of coils of large capillary blood-vessels; I, interstitial dense abrous 

 connective tissue. Magnified 350 diameters. 



occurrence. The lobular angioma is, as a rule, more deeply 

 situated than simple angioma 5 the tumor is to the naked eye 

 marked by shallow, irregular nodulations of the surface. Upon 

 invading the derma, the thinned skin covering it becomes im- 

 movable, and sometimes spontaneous ulceration takes place, 

 though the haemorrhage is rarely profuse. Cavernous angioma 

 is somewhat rarer, and appears either as a sharply circum- 



