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==Description==

==Description==

*Occurs in cats, dogs, and pigs.

Megacolon is a state of permanently increased diameter of the large bowel. This change in intestinal structure leads to abnormal function, including reduced colonic motility and chronic constipation. The condition most commonly occurs in cats and dogs, but pigs can also be afffected. White foals suffering congenital colonic agangliosis, an autosomal recessive trait, may develop secondary megacolon.

*May be due to a lack of myenteric plexuses that occurs when  neuroblasts fail to migrate from the nerual crest to the colorectal myenteric plexuses.

   

*Congenital colonic agangliosis, a condition occurring in white foals, can lead to megacolon.  It is thought to be an autosomal recessive condition.

The etiology of megacolon often remains undiagnosed

http://w3.vet.cornell.edu/nst/nst.asp?Fun=Display&imgID=632 megacolon

==Signalment==

==Signalment==

==Diagnosis==

==Diagnosis==