atresia is the absence of a normal opening or the pathological narrowing of a body channel. This can be congenital, as in esophageal atresia, or acquired, e.g. due to illness or injury.
atresia is the absence of a normal opening or the pathological narrowing of a body channel. This can be congenital, as in esophageal atresia, or acquired, e.g. due to illness or injury.