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Mayazoey
Joined 31 July 2007
→Pathology of the Large Intestine
Line 40:
Line 40:
describe plus stenosis vs complete (atresia)+
Young B, Heath, JW: Wheater's Functional Histology: A Text and Colour Atlas, 4th ed, pp. 249-274. Churchill Livinstone, London, England, 2000.
Young B, Heath, JW: Wheater's Functional Histology: A Text and Colour Atlas, 4th ed, pp. 249-274. Churchill Livinstone, London, England, 2000.
−== Pathology of the Large Intestine ==
+== Pathology ==
=== Developmental Anomalies ===
=== Developmental Anomalies ===
==== Segmental ====
==== Segmental ====
−Segmental anomalies of the intestines are common and range from incomplete occlusion (stenosis) to complete occlusion (atresia) of the lumen.
===== Atresia ani =====
===== Atresia ani =====
+*A common congenital defect of the lower gastrointestinal tract.
+*Both the anus and rectum can be affected.
+*Occurs in all species but is most often seen in calves and pigs.
===== Atresia coli =====
===== Atresia coli =====
+*Considered the most common segmental anomaly of the intestine in domestic animals.
+*Can affect in particular the spiral colon of Holstein calves and the small colon of foals.
+===== Atresia ilei =====
+*It is less common to see atresia in the small intestine.
+*Mostly seen in calves.
+==== Persistent Meckel's diverticulum ====
+*Meckel's diverticulum is a remnant of the omphalomesenteric duct of the yolk sac.
+*Is usually an incidental finding though it can be associated with impaction and or intussusception.
==== Megacolon ====
==== Megacolon ====
+*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.
+
+
+'''References''' <br /br>
+
+Brown CC, Baker DC, Barker IK: Alimentary System. In: Jubb, Kennedy and Palmer's Pathology of Domestic Animals, ed. Maxie MG, 5th ed., pp. 1-296. Elsevier, Philadelphia, PA, 2007.
+
+McGavin DM & Zachary, JF: Pathologic Basis of Veterinary Disease, 4th ed, pp. 301-393. Elsevier, St. Louis, Missouri, 2007.
+
=== Physical Disturbances ===
=== Physical Disturbances ===
==== Obstruction ====
==== Obstruction ====