Atresia

Atresia ani

Pig - atresia ani (Courtesy of Elspeth Milne)

• 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

• 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.