choanal atresia

choanal atresia

[kō′ənəl]

Etymology: Gk, choane, funnel, a + tresis, not hole

a congenital anomaly in which a bony or membranous occlusion blocks the passageway between the nose and pharynx. The condition, which is caused by the failure of the nasopharyngeal septum to rupture during embryonic development, can result in serious ventilation problems in the neonate; therefore providing an oral airway or endotracheal intubation may be necessary. The defect is usually repaired surgically shortly after birth.

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atresia

congenital absence or closure of a normal body opening or tubular structure.

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anal atresia, atresia ani

see anal atresia.

aortic atresia

absence of the opening from the left ventricle of the heart into the aorta.

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

see imperforate buccopharyngeal membrane.

follicular atresia, atresia folliculi

premature degeneration and resorption of a graafian follicle of the ovary. It may be postovulatory or preovulatory atresia. It is a normal occurrence when several ova mature together. Abnormal atresia may be a cause of anestrus.

ileal atresia, atresia ilei

the congenital obstruction in calves may cause sufficient abdominal distention to result in dystocia.

inherited alimentary tract segmental atresia

occurs in cattle and horses. A variety of segments are involved, including ileum, colon, rectum and anus.

jejunal atresia, atresia jejuni

resembles ileal atresia clinically.

lacrimal puncta atresia

atresia of the lacrimal puncta causing tearing from birth.

mesonephric duct atresia

causes stenosis or aplasia of epididymis or ductus deferens.

nasolacrimal duct atresia

atresia of the nasolacrimal duct causing tearing from birth.

paramesonephric duct atresia

causes uterus unicornis or duplex uterus or segmental aplasia of a uterine horn or tube.

rectal atresia, atresia recti

congenital absence of luminal development leading to abdominal distention after birth. There is obvious absence of feces and staining and inability to pass a sound.

salivary duct atresia

congenital atresia causes distention of the gland followed by atrophy.

tracheal atresia

common in English bulldogs; may be segmental or affect the entire length of the tube.

tricuspid atresia

absence of the opening between the right atrium and right ventricle, circulation being made possible by an atrial septal defect.

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choanal

pertaining to or arising from the choanae.

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choanal atresia

see imperforate buccopharyngeal membrane.

choanal slit

the sagittal slit in the hard palate of the normal bird.

choanal stenosis

choanal atresia.

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choanal atresia

Posterior choanal atresia ENT A partial or complete obstruction of bony–90% of cases or membranous passages from the nasal cavity to the nasopharynx, due to a persistent nasopharyngeal or buccopharyngeal membrane Management Transpalatal removal of obstruction and part of the posterior nasal septum, to prevent scarring; if membranous, probe perforation, laserization, cauterization may suffice.