Neoplasms 387 



Siedamgrotzky, Almy, Cadeac, Sutton, Znamensky. Minute cysts 

 occur in the kidney as a result of interstitial nephritis. 



Hydrocholecysts result from obstruction in or about the Ductus 

 Choledochus, due to gall stones (Froehner), carcinoma of the head 

 of the pancreas (Nocard) or of the duodenum (Eberlein). This 

 condition is common to obstructive icterus. The term Ranula is 

 applied to all cysts occurring in the Floor of the Buccal Cavity, 

 whether of submaxillary, sublingual, or mucous origin. These cysts 

 arise through cohesion of the margins of the ducts. 



Chyle-cysts are formed of separated layers of Mesentery and 

 contain a chyle-like fluid. Caparini saw an enormous perigastric 

 cyst extending from the stomach to the pelvic inlet, which seemed 

 to have arisen under the peritoneal coat of the stomach at its greater 

 curvature and burrowed between the layers of the omentum. 



Ovarial cysts represent accumulations of unruptured ripe 

 Graafian Follicles and probably owe their origin to thickening of 

 the follicular wall owing to chronic inflammation of the ovary. They 

 develop after incomplete oophorectomies, when sufficient glandular 

 tissue is left to function. 



Uterine Cysts, under the name of Hydrometra, are character- 

 ised by accumulation and retention of the products of glandular se- 

 cretion. This condition is caused by cicatricial occlusion of the cer- 

 vical canal as a result of endocervicitis originating through injury 

 received during parturition, or it may arise through pressure at the 

 cervix by the ring in inguinal hernia. The cavity of the uterus be- 

 comes much distended and coincidently the walls hypertrophy until 

 finally the organ attains a size simulating pregnancy. Should pyo- 

 genic microorganisms gain entrance, they develop rapidly in the 

 highly albuminous contents and produce the condition known as 

 Pyometra. 



Sebaceous cysts have received the name of Atheroma. They are 

 usually small and contain a semi-fluid material. They are liable to 

 undergo secondary changes through irritation leading to inflamma- 

 tion and suppuration. According to Sutton, the contents may burst 

 through the capsule and becoming exposed to the atmosphere, dry, 

 and assume a brownish-black color and become very hard. The 

 mass is composed of epidermal scales which in consequence of the 

 exposure resembles horn in appearance and consistence. If the dried 

 mass is allowed to remain, growth continues at the base until at 



