atresia

(redirected from atresia ani)
Also found in: Dictionary, Thesaurus, Encyclopedia.

atresia

 [ah-tre´zhah]
congenital absence or closure of a normal body opening or tubular structure; see also obstruction. adj., adj atret´ic.
anal atresia (atresia a´ni) imperforate anus.
aortic atresia
1. congenital absence of the aortic orifice.
2. absence or closure of the aortic orifice, a rare congenital anomaly in which the left ventricle is hypoplastic, so that oxygenated blood passes from the left into the right atrium through a septal defect, and the mixed venous and arterial blood passes from the pulmonary artery to the aorta by way of a patent ductus arteriosus.
aural atresia absence of closure of the auditory canal.
biliary atresia congenital obliteration or hypoplasia of one or more components of the bile ducts, resulting in persistent jaundice and liver damage.
choanal atresia blockage of the posterior nares. When the blockage is bilateral in a newborn, it produces acute respiratory distress because neonates are nose-breathers. Diagnosis is confirmed if a catheter cannot be passed through the nares. Until surgery is done to relieve the obstruction, insertion of an airway may be necessary.
esophageal atresia congenital lack of continuity of the esophagus, commonly accompanied by tracheoesophageal fistula, and characterized by accumulations of mucus in the nasopharynx, gagging, vomiting when fed, cyanosis, and dyspnea. Treatment should begin with suction of the upper esophageal pouch, followed by surgical repair by esophageal anastomosis and division of the fistula as soon as the infant's general condition permits.
follicular atresia (atresia folli´culi) the normal death of the ovarian follicle when unfertilized.
laryngeal atresia congenital lack of the normal opening into the larynx.
mitral atresia congenital obliteration of the mitral orifice; it is associated with hypoplastic left heart syndrome and transposition of great vessels.
prepyloric atresia congenital membranous obstruction of the gastric outlet, characterized by vomiting of gastric contents only. Called also pyloric atresia.
pulmonary atresia congenital severe narrowing or obstruction of the pulmonary orifice, with cardiomegaly, reduced pulmonary vascularity, and right ventricular atrophy. It is usually associated with tetralogy of fallot, transposition of great vessels, or other cardiovascular anomalies.
pyloric atresia prepyloric atresia.
tricuspid atresia absence of the tricuspid orifice, circulation being made possible by an atrial septal defect.
 Tricuspid atresia, here displaying a ventricular septal defect and normally related great arteries, the arrows showing the altered flow of blood through the heart. From Dorland's, 2000.
urethral atresia imperforation of the urethra.

a·tre·si·a

(ă-trē'zē-ă), Do not confuse this word with stenosis.
Congenital absence of a normal opening or normally patent lumen.
Synonym(s): clausura
[G. a- priv. + trēsis, a hole]

atresia

(ə-trē′zhə, -zhē-ə)
n.
1. The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
2. The degeneration and resorption of one or more ovarian follicles before a state of maturity has been reached.

a·tre·sic (-zĭk, -sĭk) adj.

atresia

Closure or absence of an orifice or tubular structure.

atresia

Embryology Closure or absence of an orifice or tubular structure. See Anal atresia, Biliary atresia, Choanal atresia, Duodenal atresia, Esophageal atresia.

a·tre·si·a

(ă-trē'zē-ă)
Congenital absence of a normal opening or normally patent lumen.
[G. a- priv. + trēsis, a hole]

atresia

1. Developmental failure of the formation of the lumen of a normally hollow organ or duct.
2. The absence of an opening in a natural channel of the body.

Atresia

A congenital defect in which the blood pumped through the body has too little oxygen. In tricuspid atresia, the baby lacks a triscupid valve. In pulmonary atresia, a pulmonary valve is missing.

a·tre·si·a

(ă-trē'zē-ă)
Congenital absence of a normal opening or normally patent lumen.
[G. a- priv. + trēsis, a hole]
References in periodicals archive ?
Atresia ani is a congenital and hereditary anomaly in calves which may occur due to presence of recessive gene (Loynachan et al., 2006), environmental teratogens, plant toxins (Bademkiran, 2009) and viral infections (Loynachan et al., 2006).
Atresia ani is a condition which could be treated by a simple surgical protocol with good prognosis and requires additional cumbersome procedures if any additional associated affections persist in cases of delayed presentation.
Congenital rectovaginal fistula with atresia ani in a heifer: A case report.
Atresia Ani:A Congenital Defect & Its Successful Management in Non-Descript Calf.
Congenital atresia ani associated with recto-vaginalfistula in Ongole calf.
Complete diphallia imperforate ani (type 2 atresia ani) and an accessory scrotum in a 5-day-old calf.
Preservation of fistula for reconstruction of the anal canal and the anus in atresia ani and rectovastubular fistula in 2 dogs.
Surgical repair of congenital recto-vaginal fistula with atresia ani in a cow calf.
Atresia ani associated with rectovestibular fistula and vulvar agenesis in a buffalo calf.
Surgical management of atresia ani with rectovaginal fistula in a calf--A case report.
Congenital colovesical fistula and atresia ani et racti in a lamb.
Surgical management of atresia ani in a new born lamb.