THE PATHOLOGICAL ANATOMY 



291 



zone, and as their central portions become more and more removed from 

 their blood supplies an outgrowing of the blood supply so to speak, 



Fig. 25. Intermediate adenoma showing 

 small but differentiated alveoli. (After 

 Marine, J. Med. Research, 1913: 27.) 



Fig. 24. Simple adenoma (colloid 

 phase), showing the absence of true 

 capsule but presence of a rudimentary 

 false capsule. (After Marine, J. Med. 

 Research, 1913: 27.) 



atrophy, degeneration, necrosis, cyst formation and other destructive meta- 

 morphoses occur. This tendency is most pronounced in the fetal ade- 

 nomas, and less so in the simple adenomas where the blood vessels are 



Fig. 26. Intermediate adenoma illustrat- Fig. 27. Fetal adenoma. (After Marine, 

 ing borderline type between the arbitrary J. Med. Research, 1913: 27.) 



divisions of fetal and intermediate ade- 

 nomas. (After Marine, J. Med. Research, 

 1913: 27.) 



well developed. The alveoli are larger and most irregular in simple 

 adenomas, and progressively become smaller and more regular in outline 



