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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 ====
 
Segmental anomalies of the intestines are common and range from incomplete occlusion (stenosis) to complete occlusion (atresia) of the lumen.
 
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 ====
 
==== Megacolon ====
 
*Occurs in cats, dogs, and pigs.  
 
*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.
 
*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
 
http://w3.vet.cornell.edu/nst/nst.asp?Fun=Display&imgID=632 megacolon
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'''References''' <br /br>
 
'''References''' <br /br>
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