Lacrimal duct atresia SNOMEDCT_US:278530008 HP:0007729 A developmental disorder of the lacrimal drainage system that most often affects the lacrimal ostium and resulting in non-opening of the nasolacrimal duct. It usually results from a non-canalization of the nasolacrimal duct. Imperforate nasolacrimal ducts Nasolacrimal duct atresia UMLS:C0344511 HP:0000564 Abnormal lacrimal duct morphology lacrimal drainage system atresia