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Encyclopedia > Atresia

Atresia is a condition in which a body orifice or passage in the body is abnormally closed or absent. Examples of atresia include biliary atresia. Biliary atresia is a rare condition in newborn children in which the biliary tract between the liver and the intestine is blocked or absent. ...


In ovarian follicle atresia, atresia refers to the degeneration and subsequent resorption of one or more immature ovarian follicles. Ovarian follicles or Graafian follicles (after Regnier de Graaf) are the roughly spherical cell aggregations in the ovary containing an ovum and from which the egg is released during ovulation. ...


Other forms include

Esophageal atresia is a congenital medical condition (birth defect) which effects the alimentary tract. ... Choanal atresia is a congenital defect where the back of the nasal passage is blocked, usually by abnormal bony or membranous tissue. ... Pulmonary atresia is a congenital malformation of the pulmonary valve in which the valve orifice fails to develop. ...

External link

  • Definitions of Atresia

  Results from FactBites:
 
Ear Surgery Information Center-Atresia (2088 words)
Congenital Atresia, the absence of the external ear canal, is a birth defect which is almost always accompanied by abnormalities of both the middle ear bones in various degrees, as well as the external ear.
In most cases of atresia (or lack of development of the external ear), there is a bony plate which separates the external ear from the contents of the middle ear where the bones of hearing are present.
The parents are advised on the potential for reconstruction, based on the degree of development of the child's middle ear, inner ear, and mastoid, as well as the position of the facial nerve and the relative absence of or deformity of the bones of hearing.
Tricuspid Atresia, Cincinnati Children's Hospital Medical Center (1465 words)
Tricuspid atresia is a type of congenital heart disease in which the valve between the right atrium and right ventricle fails to develop.
The diagnosis of tricuspid atresia, and the associated specific problems such as a ventricular septal defect or transposition of the great arteries, can be very accurately diagnosed by echocardiography.
The results of this staged approach to the child with tricuspid atresia are generally good, with an expected survival of all three stages of 75 percent to 95 percent depending on the exact malformations and surgery for any given individual.
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