Duodenal atresia, duodenal stenosis and annular pancreas are the most common congenital condi-
tions to affect the duodenum. All are capable of giving rise to duodenal obstruction. The incidence is reported to be between 1 in 5000 and 1 in 10 000 live births.8
Explanations of the etiology of duodenal atresias are not universally accepted. Unlike atresias of the ileum, they are not thought to be due to vascular accidents and the most widely accepted explanation is that of failure of recanalization of the intestinal lumen during early embryonic development.
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