PAPILLOMA. 



299 



Papilloma and Adenoma. 



A papilloma is a wartlike excrescence composed of papillae 

 resembling those of the skin and mucous membranes or the 



FIG. 128. 



Endothelioma from the floor of the mouth (Earth). Older portion of the growth. 

 This has a general alveolar structure, the alveoli being separated by a vascular- 

 ized areolar tissue, n, n, necrosed groups of endothelial cells ; h, h, similar ne- 

 crosed masses that have undergone hyaline degeneration. 



FIG. 129. 



Section of wart of skin, a, coriuni; b, enlarged papillae; c, stratified horny layer. 



X 40 (Ziegler). 



