Congenital nasolacrimal duct obstruction is most often due to an imperforate membrane at the valve of Hasner.
Congenital disorder | obstruction of justice | Congenital adrenal hyperplasia | Bowel obstruction | X-linked congenital stationary night blindness | Parotid duct | Obstruction of justice | Leber's congenital amaurosis | Duct tape occlusion therapy | Congenital lacrimal duct obstruction | Congenital insensitivity to pain with anhidrosis | Congenital fiber type disproportion | congenital disorder | Congenital chloride diarrhea | congenital adrenal hyperplasia | Bottle en ''col de cygne'' (Swan neck duct) used by Louis Pasteur | bile duct |