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What is an atresia?

What is an atresia? Here are some definitions.

Noun
  1. (pathology) A condition in which a body orifice or passage in the body is abnormally closed or absent.
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Examples
Tissue remodeling occurs as ovarian follicles undergo maturation or atresia.
This results in atresia of the dominant follicle and re-initiation of follicular recruitment.
Mary has pulmonary atresia, a condition that means the heart and the main blood vessel to the lungs have failed to develop properly.
In babies with esophageal atresia, the esophagus comes to a dead end instead of connecting to the stomach.
In fact, in one strain, the number of ovarian follicles actually increased with age from birth to young adulthood, despite marked atresia.
These structures form through a process of follicular atresia accompanied by hypertrophy of the follicular cells.

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