Atresia comes from the Greek, a meaning that does not exist, tresis means nutrition or food. In medical terms atresia itself is the absence of normal weight or closing of holes or tubular organ in congenital called clausura.
In other words there is no hole in its proper place or perforated appendix tract or body cavity, this can occur because of congenital or occur later due to disease process on the channel. Atresia can occur in all channels of the body, such as atresia ani. So atresia ani is a form of congenital abnormality in which there is no anal opening, especially in infants, which clogged the rectum lies above the levator sling, also known by the term "AGNESIS rectum. "
Atresia ani have another name that is imperforate anus or anorectal malformations. If atresia ani occurs it is almost always require surgery to create channels like the normal state according to Ladd and Gross (1966) imperforate anus in 4 groups, namely:
1. Stenosis of the lower rectum or the anus (first type)
2. Persistent anal membrane (Second Type)
3. Imperforate anus and rectum are dead-end tip is located at various distances from the peritoneum (Type Three)
4. Separate anus with the tip of the rectum (Type Four)
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