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Category:Intestines - Developmental Pathology (view source)

Revision as of 11:58, 31 May 2010

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~~=== Developmental Anomalies ===~~

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==== Segmental ====

Segmental anomalies of the intestines are common and range from incomplete occlusion (stenosis) to complete occlusion (atresia) of the lumen.

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~~===== Atresia ani =====~~

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~~[[Image:atresia ani PM.jpg|right|thumb|125px|<small><center>Pig - atresia ani (Courtesy of Elspeth Milne)</center></small>]]~~

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*A common congenital defect of the lower gastrointestinal tract.

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*Both the [[Anus - Anatomy & Physiology|anus]] and [[Rectum - Anatomy & Physiology|rectum]] can be affected.

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*Occurs in all species but is most often seen in calves and pigs.

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~~===== Atresia coli =====~~

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[[Atresia]]

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*Considered the most common segmental anomaly of the intestine in domestic animals.

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*Can affect in particular the spiral [[Colon - Anatomy & Physiology|colon]] of Holstein calves and the small [[~~Colon - Anatomy & Physiology|colon]] of foals.~~

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~~=====~~ Atresia ~~ilei =====~~

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*It is less common to see atresia in the [[Small Intestine - Anatomy & Physiology|small intestine]].

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*Mostly seen in calves.

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~~==== Persistent Meckel's diverticulum ====~~

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*Meckel's diverticulum is a remnant of the omphalomesenteric duct of the yolk sac.

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*Is usually an incidental finding though it can be associated with impaction and/or intussusception.

==== Megacolon ====

*Occurs in cats, dogs, and pigs.

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*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

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'''References''' <br /br>

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