v57 



firmly adherent to the adjacent tissue or it may be lo<.>selv at- 

 tached. 



The cystic content varies according to the nature of the cyst. 

 I'rine, milk, sali\a, mucus, semen, liqucjr foUiculi and other secre- 

 tions and excretions are represented in c\stic ctmtents. Blood 

 i. e., hemorrhagic extravasates and \arious tissues that have 

 undergone collic|uatiou necrosis ma\' represent the contents of 

 cysts. The various secretions, excretions, extravasates, exudates 

 and necrotic tissue usualh' undergo some modification when re- 

 tained within a cyst. 



Varieties. — Retention cvsts. those resulting from the accumu- 

 lation and retention of normal secretions, e. g., o\'arian cysts. 

 renal cysts, mammarv c}-sts, testicular cysts, ranulae, mucus 

 cvsts, sebaceous cysts (Atheromata). 



Fig. 1S,S.- 



-Iterine Cyst thL capsul it nhich ha 1 b n m 



EA-udatioii cvsts, tho^e resulting from excessive secretion into 

 ductless glands or cavities, e.g., hygroma, capped hock, meningo- 

 cele. 



Extravasation cvsts. those resulting from hemorrhage mto tis- 

 sues or closed body cavities, e. g., hematocele, hematoma. 



Degeneration cysts, those resulting from liquefacti.m of ne- 

 crotic tissue ,e. g. coUiquation cerebral cysts. 



Parasitic cvsts. those resulting from the development of ])ara- 

 sites in the tissue, e. g., cysticercus cellulosae, cysticercus b.wis, 

 cvsticercus echinococcus, etc. 



