Atresia is a condition in which a body
orifice or passage in the body is abnormally closed or absent. Examples of atresia include:
Biliary atresiaOvarian follicle atresia, atresia refers to the degeneration and subsequent resorption of one or more immature
ovarian follicles.
Vaginal atresia - congenital occlusion of the vagina or subsequence adhesion (sticking together) of the walls of the vagina occluding it.
Esophageal atresia - affects the alimentary tract causing the esophagus to end before connecting normally to the stomach.
Choanal atresia - blockage of the back of the nasal passage, usually by abnormal bony or soft tissue.
Anorectal atresia - malformation of the opening between the rectum and anus.
Pulmonary atresia - malformation of the pulmonary valve in which the valve orifice fails to develop.
Aural atresia (see
Microtia) - a congenital deformity of the pinna (outer ear).
Intestinal atresia - malformation of the intestine
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