326 



N'ETICUI NARY PATHOLOGY. 



Clinicalh- these tuiiKirs are not as malignant as carcinomata 

 prnper, and thev have less tendenc}- to form metastases. The}' 

 arc frefjuentK- completely destroyed b}- surgical interference. 



Adenoma. — This is a glandular tumor. While it is similar 

 tti a gland it is functionless or has a perverted function. Though 

 occurring more frecjuentlv in glands, as the kidnc}-, mammae, mu- 

 cnus or sebaceous glands, testicle, liver, etc., they may occur in 

 any tissue. Swine and dugs are most frequently affected with 

 them. Thev are usualh- circumscribed, rather firm, nodular, 

 white or gravish-\^-hite masses, varying in size from a pea to a 



jwlny .Maniniar.\' -Vdenoma uf a bitch. 



man's head, in section tlie gross specimen usually appears lobu- 

 lated, and, if the tumor is large, there are usualh- necrotic centres 

 here and there through it. The blood supph- is limited, the ves- 

 sels usually being obstructed by the pressure of the new-formed 

 adenomatous tissue. 



In microscopic sections glandular cells are found in A'arious 

 arrangements as tubules, acini, etc. The mimicry, however, is 

 not complete, and there is usually little difficulty in dift'erentiat- 

 ing adenomata from normal gland tissue. The cells vary in 

 shape from short cubical to tall columnar. They are usually 



