| bronchial atresia | Severe focal narrowing or obliteration of a segmental or lobar bronchus, usually associated with distal air trapping. (05 Mar 2000) |
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| vaginal atresia | Congenital or acquired imperforation or occlusion of the vagina, or adhesion of the walls of the vagina. Synonym: ankylocolpos, colpatresia. (05 Mar 2000) |
| choanal atresia | Congenital bony or membranous occlusion of one or both choanae, due to failure of the embryonic bucconasal membrane to rupture. (12 Dec 1998) |
| pulmonary atresia | Congenital absence of the normal valvular orifice into the pulmonary artery. This condition is characterised by cardiomegaly, reduced pulmonary vascularity, and right ventricular atrophy. (12 Dec 1998) |
| duodenal atresia | <radiology> Double bubble sign, polyhydramnios, associated with, Down syndrome, VATER syndrome NB: annular pancreas also may cause duodenal obstruction, and is associated with VATER syndrome (12 Dec 1998) |
| intestinal atresia | Congenital obliteration of the lumen of the intestine, with the ileum involved in 50% of the cases and the jejunum and duodenum following in frequency. It is the most frequent cause of intestinal obstruction in the newborn infant. Its aetiology may be related to failure of recanalization during early development or to some impairment of blood supply during intrauterine life. (12 Dec 1998) |
| oesophageal atresia | A congenital anomaly where the upper oesophagus ends (atresia) and does not connect with the stomach and the lower oesophagus connects to the trachea (tracheoesophageal fistula). A common complication seen shortly after birth is an aspiration pneumonia. Infants will demonstrate excessive salivation, gagging and coughing with feeding, poor feeding and a bluish discolouration to the skin (cyanosis). Treatment involves the surgical repair of the oesophagus before the child can take anything by mouth. (27 Sep 1997) |
| tricuspid atresia | Absence of the orifice between the right atrium and ventricle, with the presence of an atrial defect through which all the systemic venous return reaches the left heart. As a result, there is left ventricular hypertrophy (hypertrophy, left ventricular) because the right ventricle is absent or not functional. (12 Dec 1998) |
| follicular atresia | <physiology> The degeneration and resorption of an ovarian follicle before it reaches maturity and ruptures. (12 Dec 1998) |
| laryngeal atresia | Congenital failure of the laryngeal opening to develop, resulting in partial or total obstruction at or just above or below the glottis. (05 Mar 2000) |
| vas | Origin: L, a vessel. See Vase. <anatomy> A vessel; a duct. Vas deferens; pl. Vasa deferentia. [L. Vas vessel + deferens carrying down. <anatomy> The excretory duct of a testicle; a spermatic duct. Source: Websters Dictionary (01 Mar 1998) |
| vas aberrans hepatis | Blind and/or atrophic bile duct remnants in the fibrous appendix and in the capsule of the liver at the margins of the left lobe and the groove for the inferior vena cava. (05 Mar 2000) |
| vas aberrans of Roth | An occasional diverticulum of the rete testis or of the efferent ductules of the testis. (05 Mar 2000) |
| vas afferens | A branch of an interlobular artery of the kidney that conveys blood to the glomerulus. Synonym: arteriola glomerularis afferens, vas afferens, afferent vessel. (05 Mar 2000) |
| vas anastomoticum | A vessel that establishes a connection between arteries, between veins, or between lymph vessels. Synonym: vas anastomoticum. (05 Mar 2000) |