atresia

n. congenital lack of an opening, cavity or passage (Medicine)

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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Atresia /atre·sia/ congenital absence or closure of a normal body opening or tubular structure.atret´ic anal atresia , atresia a´ni imperforate [more]Atresia - Community and Resources

Noun
1. an abnormal condition in which a normal opening or tube in the body (as the urethra) is closed or absent
(hypernym) abnormality, abnormalcy, abnormal condition

n. atresia, congenital lack of an opening, cavity or passage (Medicine)