Intestinal atresia is present at birth. It is an area of the intestine that has not formed correctly. In some, the intestine may be completely closed off. Atresia makes it impossible for food or fluids to pass through.

Atresia can happen in the small or large intestines and may be named by the location:

  • Pyloric atresia—just after the stomach
  • Duodenal atresia—first portion of small intestine by the stomach
  • Jejunal atresia—small intestine between upper and lower portions
  • Ilial atresia—occurs in last portion of small intestine
  • Colonic atresia—occurs in large colon

Normal Anatomy of the Intestines
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