THE LIVER 241 
notes and recent examination do not reveal parasites or 
perivascular sarcomatous change. 
Simple adenomata were observed in a woodchuck 
{Arctomys monax). This diagnosis is made with the 
appreciation that nodular regeneration of the liver after 
damage and in cirrhosis sometimes suggests tumor, but 
with adenomata an increase of supporting framework 
may occur. The liver of this animal presented numerous 
.3 to 10. cm. irregularly spherical, encapsulated, firm or 
slightly resilient, browai masses which under the micro- 
scope consisted of large pale vacuolated cells in columns 
or strands not connected with bile ducts. The last feature 
speaks in favor of the diagnosis of adenoma. The damage 
to the organ was probably considerable and the portal 
circulation must have been impeded since passive con- 
gestion and ascites were present. Enteritis and nephritis 
seemed the causes of death. 
Adenomata or fibroadenomata of bile duct origin were 
seen in four animals, a Red Fox (Canis viilpes penn- 
sylvanicus), a Gray Fox {Canis cinereo-argenteus) , a 
Jaguar (Fells onca) and a Common Deer (Masama vir- 
giniana). The first two present similar pictures, pin- 
point to 8. mm., gray, well outlined areas some of which 
are clearly cystic, others opaque and more solid. In the 
first fox a larger mass was found near the hilum. Careful 
study and consultation has failed to discover parasites in 
these cases, although their presence was strongly sus- 
pected, so that we were forced to conclude, in view of the 
rather typical microscopic picture, that they are adeno- 
mata of bile duct origin. Their scattered distribution, 
but with a tendency to be more numerous beneath the 
capsule, corresponds with a human case just brought to 
my notice. The mass in the liver of the deer was single 
and resembled an infarct, with cysts exposed by cross 
section. This tumor was found on the diaphragTuatic 
surface of the right lobe. 
