Absence of a normal opening, or failure of a structure to be tubular. Atresia can affect many structures in the body. For example, esophageal atresia is a birth defect in which part of the esophagus is not hollow, and with anal atresia, there is no hole at the bottom end of the intestine.

Congenital absence of an opening at the bottom end of the intestinal tract. Also called imperforate anus. Occurs in about 1 in 5,000 births. It is corrected by surgery. Atresia refers to the absence of a normal opening.

Congenital absence of the normal valvular opening from the left ventricle of the heart into the aorta. "Atresia" here refers to the absence of a normal opening.

Congenital absence or closure of the major bile ducts, the ducts that drain bile from the liver. Biliary atresia results in a progressive inflammatory process which may lead to cirrhosis of the liver. The infant looks normal at birth but develops jaundice after the age of 2 to 3 weeks with yellowing of the eyes and skin, light-colored stools and da [..]

The absence of a body opening that would normally be there; the absence of a certain organ that is tubular in structure.

"occlusion of a natural passage in the body," 1807, from Modern Latin atresia, from Greek atretos "not perforated," from a-, privative prefix, + tresis "perforation," fro [..]

Congenital absence of an opening in a hollow structure.

(n) an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent

Constriction of tube or canal

A Congenital Abnormality characterized by the persistence of the anal Membrane, resulting in a thin Membrane covering the normal Anal Canal. Imperforation is not always complete and is treated by Surg [..]

A Congenital Abnormality that is characterized by a blocked Choanae, the opening between the Nose and the Nasopharynx. Blockage can be unilateral or bilateral; bony or membranous.

Congenital Abnormality characterized by the lack of full development of the Esophagus that commonly occurs with Tracheoesophageal Fistula. Symptoms include excessive Salivation; Gagging; Cyanosis; and [..]

Progressive destruction or the absence of all or part of the Extrahepatic Bile Ducts, resulting in the complete obstruction of Bile flow. Usually, biliary atresia is found in Infants and accounts for [..]

The degeneration and resorption of an Ovarian Follicle before it reaches maturity and Ruptures.

Congenital obliteration of the lumen of the Intestine, with the Ileum involved in 50% of the cases and the Jejunum and Duodenum following in frequency. It is the most frequent cause of Intestinal Obst [..]

A Congenital Heart Defect characterized by the narrowing or complete absence of the opening between the RIGHT VENTRICLE and the Pulmonary Artery. Lacking a normal Pulmonary Valve, unoxygenated Blood i [..]

Absence of the orifice between the RIGHT ATRIUM and RIGHT VENTRICLE, with the presence of an atrial defect through which all the systemic venous return reaches the left Heart. As a result, there is Le [..]

lang=en * year=2008 |article=Immature ovum |passage=Most degenerate by atresia, but a few go through ovulation, and that's the trigger to the next step.

(pathology) A condition in which a body orifice or passage in the body is abnormally closed or absent.