TUMORS. 



345 



and may infiltrate the tissues deeply or remain near the surface ; or may 

 project above the surface, forming wart-like or papillary growths. These 



FIG. 194. EPITHELIOMA OF SKIN. 

 Showing retieular masses of epithelial cells with fibrous stroma. 



tumors frequently ulcerate on the surface (Fig. 185), and the skin about 

 them is apt to become thickened (Fig. 195). 



Epitheliomata are most apt to occur in the skin, especially in those 

 parts in which it becomes continuous with mucous membranes lips, ex- 

 ternal nasal openings, eyelids,, labia, and glans penis and are frequent 

 in the mouth, ossophagus, vagina, and about the cervix uteri. They 

 may develop in congenital nsevi of the skin, such as that shown in Fig. 



FIG. 195. EPITHELIOMA OF BACK OF HAND. 



The flat tumor occupied nearly the entire back of the hand, and was ulcerating at the surface. The fig- 

 ure shows the edge of the tumor and a portion of the ulcer. The papillae of the skin over the edge of the 

 growth are hypertrophied, and the tissue about is infiltrated with small spheroidal cells. Fig. 192 shows a 

 section from a metastatic tumor of the axillary lymph-node in this case. This tumor presented the gross 

 appearance shown in the photographic reproduction in Fig. 185. 



