* Anal atresia -- congenital absence of a hole at the bottom end
of the intestine. Also called imperforate anus. * Aortic atresia --
congenital absence of the normal valvular opening into the aorta. *
Biliary atresia -- absence of the major bile ducts. * Choanal
atresia -- congenital failure of one or both nasal passages to
open. * Esophageal atresia -- a birth defect in which part of
esophagus is not hollow. * Intestinal atresia -- obliteration of
the hollow of the small intestine, involving the ileum (50% of
cases) or the jejunum or duodenum. * Laryngeal atresia --
congenital failure of the laryngeal opening to develop, resulting
in partial or total obstruction at or just above or below the
glottis. * Pulmonary atresia -- congenital absence of the pulmonary
valve opening in the heart. * Tricuspid atresia -- congenital lack
of the tricuspid valve opening. * Vaginal atresia -- congenital
occlusion of the vagina or subsequence adhesion (sticking together)
of the walls of the vagina occluding it.
