Definition of Duodenal atresia:

Duodenal atresia is a condition in which the first part of the small bowel (the duodenum) has not developed properly. It is not open and cannot allow the passage of stomach contents.

Causes, incidence, and risk factors:

The cause of duodenal atresia is unknown, but it is thought to result from problems during an embryo's development in which the duodenum does not normally change from a solid to a tube-like structure.

Duodenal atresia is seen in more than 1 in 10,000 live births. Approximately 20-30% of infants with duodenal atresia have Down syndrome. Duodenal atresia is often associated with other birth defects.