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The causes of biliary tract obstruction may be '''intraluminal''' or '''extraluminal''':
 
The causes of biliary tract obstruction may be '''intraluminal''' or '''extraluminal''':
 +
 
<u>Intraluminal obstructions:</u>
 
<u>Intraluminal obstructions:</u>
 
*'''Choleliths''' ('gall stones') are much less common in animals than they are in humans.  They are usually composed of bilirubin salts in dogs and calcium carbonate in cats, although they are very rare in the latter species.
 
*'''Choleliths''' ('gall stones') are much less common in animals than they are in humans.  They are usually composed of bilirubin salts in dogs and calcium carbonate in cats, although they are very rare in the latter species.
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