Atresia is a condition in which an orifice or passage in the body is (usually abnormally) closed or absent.[1]

Examples of atresia include:

  • Aural atresia, a congenital deformity where the ear canal is underdeveloped.[2]
  • Biliary atresia, a condition in newborns in which the common bile duct between the liver and the small intestine is blocked or absent.[3]
  • Choanal atresia, blockage of the back of the nasal passage, usually by abnormal bony or soft tissue.[4]
  • Esophageal atresia, which affects the alimentary tract and causes the esophagus to end before connecting normally to the stomach.[5]
  • Follicular atresia, degeneration and resorption of the ovarian follicles.[1]  
  • Imperforate anus, malformation of the opening between the rectum and anus.[6]
  • Intestinal atresia, malformation of the intestine, usually resulting from a vascular accident in utero.[7]
  • Microtia, absence of the ear canal or failure of the canal to be tubular or fully formed[8] (can be related to Microtia, a congenital deformity of the pinna, or outer ear).
  • Ovarian follicle atresia, the degeneration and subsequent resorption of one or more immature ovarian follicles.[9]
  • Potter sequence, congenital decreased size of the kidney leading to absolutely no functionality of the kidney, usually related to a single kidney.
  • Pulmonary atresia, malformation of the pulmonary valve in which the valve orifice fails to develop.[10]
  • Renal agenesis, only having one kidney.
  • Tricuspid atresia, a form of congenital heart disease whereby there is a complete absence of the tricuspid valve, and consequently an absence of the right atrioventricular connection.[11]
  • Vaginal atresia, a congenital occlusion of the vagina or subsequent adhesion of the walls of the vagina, resulting in its occlusion.


  1. ^ a b Dorland's illustrated medical dictionary. Dorland, W. A. Newman (William Alexander Newman), 1864-1956. (32nd ed.). Philadelphia, PA: Saunders/Elsevier. 2012. p. 174. ISBN 978-1-4160-6257-8. OCLC 706780870.CS1 maint: others (link)
  2. ^ Christensen, L. "Understanding Atresia, Microtia, and the Baha System". audiologyonline. Retrieved 14 April 2020.
  3. ^ Zieve, David. "Biliary atresia". PubMed Health. Retrieved 11 September 2012.
  4. ^ Zieve, David. "Choanal atresia". Pubmed Health. Retrieved 11 September 2012.
  5. ^ Dugdale, David. "Esophageal atresia". PubMed Health. Retrieved 11 September 2012.
  6. ^ Kaneshiro, Neil. "Imperforate Anus". PubMed Health. Retrieved 11 September 2012.
  7. ^ "Intestinal atresia". Pedisurg. Retrieved 11 September 2012.
  8. ^ Bonilla, Arthuro. "Microtia: Congenital ear deformity Institute". Congenital ear deformity Institute. Retrieved 11 September 2012.
  9. ^ Kaipia, A.; Hsueh, A. J. W. (1997). "Regulation of Ovarian Follicle Atresia". Annual Review of Physiology. 59: 349–363. doi:10.1146/annurev.physiol.59.1.349. PMID 9074768.
  10. ^ Schumacher, Kurt. "Pulmonary atresia". PubMed Health. Retrieved 11 September 2012.
  11. ^ "Tricuspid atresia". PubMed Health. Retrieved 11 September 2012.

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