- Occurs in cats, dogs, and pigs.
- 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.
http://w3.vet.cornell.edu/nst/nst.asp?Fun=Display&imgID=632 megacolon