Changes

*'''Aberrant migration of intestinal helminths''' may cause an obstruction if they enter the common bile duct.  This has been reported with ''[[Ascaris suum]]'' in pigs and ''[[Parascaris equorum]]'' in horses and it may occur after these animals have been treated with an anthelmintic that causes spasticity of the parasite muscles.

*'''Aberrant migration of intestinal helminths''' may cause an obstruction if they enter the common bile duct.  This has been reported with ''[[Ascaris suum]]'' in pigs and ''[[Parascaris equorum]]'' in horses and it may occur after these animals have been treated with an anthelmintic that causes spasticity of the parasite muscles.

<u>Extraluminal obstructions:</u>

<u>Extraluminal obstructions:</u>

*[[Pancreatitis - Dog and Cat|'''Pancreatitis''']] is the most common cause of obstruction in dogs.  '''Pancreatic abcesses''' or '''neoplasia''' may also obstruct the flow of bile.

*[[Pancreatitis|'''Pancreatitis''']] is the most common cause of obstruction in dogs.  '''Pancreatic abcesses''' or '''neoplasia''' may also obstruct the flow of bile.

*[[Biliary Tract - Rupture|'''Biliary tract rupture''']]

*[[Biliary Tract - Rupture|'''Biliary tract rupture''']]

*'''Pyloric''' or '''duodenal mass'''

*'''Pyloric''' or '''duodenal mass'''