stenochoria

Abnormal contraction of a canal or orifice.

Narrowing or contraction of a body passage or opening. See also specific anatomical sites.

• aortic s. — obstruction to the outflow of blood from the left ventricle into the aorta. May be due to an anomaly of the valves (valvular), an obstruction in the ascending aorta (supravalvular), or an obstruction in the left ventricular outflow tract (subvalvular). See also aortic subvalvular stenosis, aortic valvular disease.
• esophageal s. — a common cause of esophageal obstruction, caused commonly by esophageal trauma; congenital stenosis often associated with tracheoesophageal fistula.
• left atrioventricular s. — see mitral stenosis (below), valvular stenosis.
• mesonephric duct s. — occurs as stenosis of the ductus deferens or epididymis; may be associated with renal aplasia.
• mitral s. — a narrowing of the left atrioventricular orifice. See also mitral commissurotomy.
• nasopharyngeal s. — an acquired disorder in cats, usually following chronic upper respiratory infection, which causes upper airway obstruction with mucopurulent nasal discharge and a wheezing respiration, which is relieved with open mouth breathing.
• paramesonephric duct s. — focal defects in the duct lead to segmental aplasia or stenosis of the uterine tube or horn.
• pulmonary artery s. — the commonest cardiac defect in dogs; it is a narrowing of the pulmonary outflow tract and may occur in any one of a number of common sites including infundibular, valvular and subvalvular.
• rectovaginal s. — see rectovaginal constriction.
• right atrioventricular s. — see tricuspid stenosis (below).
• subepiglottic s. — has the effect of reducing air flow into and out of the lungs.
• tricuspid s. — narrowing or stricture of the tricuspid orifice of the heart.
• valvular s. — see aortic, pulmonary, atrioventricular.