From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

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

Examples of atresia include:

  • Biliary atresia, a condition in newborns in which the common bile duct between the liver and the small intestine is blocked or absent.[1]
  • Choanal atresia, blockage of the back of the nasal passage, usually by abnormal bony or soft tissue.[2]
  • Esophageal atresia, which affects the alimentary tract and causes the esophagus to end before connecting normally to the stomach.[3]
  • Imperforate anus, malformation of the opening between the rectum and anus.[4]
  • Intestinal atresia, malformation of the intestine, usually resulting from a vascular accident in utero.[5]
  • Microtia, absence of the ear canal or failure of the canal to be tubular or fully formed[6] (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.[7]
  • 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.[8]
  • 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.[9]
  • Vaginal atresia, a congenital occlusion of the vagina or subsequent adhesion of the walls of the vagina, resulting in its occlusion.


  1. ^ Zieve, David. "Biliary atresia". PubMed Health. Retrieved 11 September 2012.
  2. ^ Zieve, David. "Choanal atresia". Pubmed Health. Retrieved 11 September 2012.
  3. ^ Dugdale, David. "Esophageal atresia". PubMed Health. Retrieved 11 September 2012.
  4. ^ Kaneshiro, Neil. "Imperforate Anus". PubMed Health. Retrieved 11 September 2012.
  5. ^ "Intestinal atresia". Pedisurg. Retrieved 11 September 2012.
  6. ^ Bonilla, Arthuro. "Microtia: Congenital ear deformity Institute". Congenital ear deformity Institute. Retrieved 11 September 2012.
  7. ^ 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.
  8. ^ Schumacher, Kurt. "Pulmonary atresia". PubMed Health. Retrieved 11 September 2012.
  9. ^ "Tricuspid atresia". PubMed Health. Retrieved 11 September 2012.