308 PATHOLOGY OF NUTRITION. 



Retention-cysts result from the accumulation or retention of 

 the natural secretion of a gland, due to the obstruction of its 

 duct. As examples may be mentioned sebaceous cysts or 

 wens ; and ranula, which results from obstruction of the ducts 

 of the salivary gland. As the result of obstruction of a ureter 

 the whole kidney may be converted into a cyst. 



Disintegration-cysts result from degenerative softening and 

 disintegration of normal or pathological tissues. This may 

 occur after hemorrhage into the brain apoplectic cyst. Para- 

 sitic cysts might be included under this head for example, 

 hydatid cysts. Tumors, especially sarcomata and chondro- 

 mata, are liable to cystic degeneration. 



