In Medicine is called atresia, the presence of an obstacle or occlusion of a normal hole or duct of a patient's body. The term is also used in Veterinary Medicine and Biology when referring to the same concept for an animal. . It may, for example, occur in the esophagus (esophageal atresia) . It may be a birth defect in which part of the baby's esophagus (lack of perforation of the esophagus).
