mitral atresia

atresia /atre·sia/ (ah-tre´zhah) congenital absence or closure of a normal body opening or tubular structure.atret´ic

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anal atresia , atresia a´ni imperforate anus.

aortic atresia  congenital absence of the aortic orifice.

biliary atresia  obliteration or hypoplasia of part of the bile ducts due to arrested fetal development, causing persistent jaundice and liver damage ranging from biliary stasis to biliary cirrhosis, with splenomegaly as portal hypertension progresses.

follicular atresia  degeneration and resorption of an ovarian follicle before it reaches maturity and ruptures.

laryngeal atresia  congenital lack of the normal opening into the larynx.

mitral atresia  congenital obliteration of the mitral orifice, often associated with hypoplastic left heart syndrome or transposition on great vessels.

prepyloric atresia  pyloric atresia; congenital membranous obstruction of the gastric outlet, with vomiting of gastric contents only.

pulmonary atresia  congenital severe narrowing or obstruction of the pulmonary orifice, with cardiomegaly, reduced pulmonary vascularity, and right ventricular atrophy. It is usually associated with tetralogy of Fallot, transposition of great vessels, or other cardiovascular anomalies.

pyloric atresia  prepyloric a.

tricuspid atresia  congenital absence of the tricuspid orifice, circulation being made possible by the presence of an atrial septal defect.

Tricuspid atresia, here displaying a ventricular septal defect and normally related great arteries, the arrows showing the altered flow of blood through the heart.

urethral atresia  congenital imperforation of the urethra.

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mitral atresia

n.

The congenital absence of the normal mitral valve orifice.

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mitral atresia,

a congenital absence of the mitral valve associated with transposition of the great vessels or hypoplastic left heart syndrome. See also valvular heart disease.