Esophageal atresia (Human Phenotype Ontology entry HP_0002032) is a developmental defect resulting in complete obliteration of the lumen of the esophagus such that the esophagus ends in a blind pouch rather than connecting to the stomach. Also known as: Birth defect in which part of esophagus did not develop, Birth defect in which part of oesophagus did not develop, EA.