A congenital condition where a normal body opening or passage is absent or completely closed, preventing normal function.
Variant spelling of atresia, from Greek a- 'without' + tresis 'opening' + -y suffix forming abstract nouns. Used in medical literature as an alternative form of the primary term.
Babies born with atresy in their esophagus or intestines need immediate surgery—it's why ultrasound screening during pregnancy looks for these openings to catch problems before birth.
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