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Atresia (plural: atresias) refers to a situation where there is absence, underdevelopment or abnormal closure, of a normal anatomical tubular structure or opening.
Contrast this with agenesis which refers to the complete absence of any anatomical structure including its primordial precursors.
Some authors occasionally overlap the two terms (i.e. atresia and agenesis), which in general is an erroneous practice.