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A stricture of any canal or orifice. [G. s., a narrowing]

- aortic s. pathologic narrowing of the aortic valve orifice.

- bronchial s. narrowing of the lumen of a bronchial tube. SYN: bronchiostenosis.

- buttonhole s. extreme narrowing, usually of the mitral valve.

- calcific nodular aortic s. most common type of aortic s., occurring usually in elderly men, in which the cusps contain calcified fibrous nodules on both surfaces; the causes include rheumatic fever, atherosclerosis, age-related degeneration, and congenitally bicuspid aortic valve.

- congenital pyloric s. SYN: hypertrophic pyloric s..

- coronary ostial s. narrowing of the mouths of the coronary arteries as a result of syphilitic aortitis or atherosclerosis.

- Dittrich s. SYN: infundibular s..

- double aortic s. subaortic s. associated with s. of the valve itself, both lesions being congenital.

- fish-mouth mitral s. extreme mitral s..

- hypertrophic pyloric s. muscular hypertrophy of the pyloric sphincter, associated with projectile vomiting appearing in the first few weeks of life, more commonly seen in males. SYN: congenital pyloric s..

- idiopathic hypertrophic subaortic s. left ventricular outflow obstruction due to hypertrophy, usually congenital, of the ventricular septum. SYN: muscular subaortic s..

- idiopathic subglottic s. narrowing of the infraglottic lumen, of unknown cause; apparently occurring only in women.

- infundibular s. narrowing of the outflow tract of the right ventricle below the pulmonic valve; may be due to a localized fibrous diaphragm just below the valve or, more commonly, to a long narrow fibromuscular channel. SYN: Dittrich s..

- laryngeal s. narrowing or stricture of any or all areas of the larynx; may be congenital or acquired.

- mitral s. (MS) pathologic narrowing of the orifice of the mitral valve.

- muscular subaortic s. SYN: idiopathic hypertrophic subaortic s..

- pulmonary s. narrowing of the opening into the pulmonary artery from the right ventricle.

- pyloric s. narrowing of the gastric pylorus, especially by congenital muscular hypertrophy or scarring resulting from a peptic ulcer. SEE ALSO: hypertrophic pyloric s..

- subaortic s. congenital narrowing of the outflow tract of the left ventricle by a ring of fibrous tissue or by hypertrophy of the muscular septum below the aortic valve. SYN: subvalvar s..

- subvalvar s. SYN: subaortic s..

- subvalvular aortic s. congenital narrowing below the aortic valves due to a membrane or to a muscular hypertrophy frequently confused with valvular aortic s..

- supravalvar s. narrowing of the aorta above the aortic valve by a constricting ring or shelf, or by coarctation or hypoplasia of the ascending aorta.

- supravalvular s. s. distal to the aortic valve due usually to a congenital membrane. Patients usually have a kind of elfin facies and resemble each other more than they do members of their family.

- tricuspid s. pathologic narrowing of the orifice of the tricuspid valve.

ste·no·sis stə-'nō-səs n, pl -no·ses -.sēz a narrowing or constriction of the diameter of a bodily passage or orifice <esophageal \stenosis> see AORTIC STENOSIS, MITRAL STENOSIS, PULMONARY STENOSIS, SPINAL STENOSIS, SUBAORTIC STENOSIS

the abnormal narrowing of a passage or opening, such as a blood vessel or heart valve. See aortic stenosis, carotid-artery stenosis, mitral stenosis, pulmonary stenosis, pyloric stenosis.