Stenosis

A stenosis (from Ancient Greek στενός, "narrow") is an abnormal narrowing in a blood vessel or other tubular organ or structure such as foramina and canals. It is also sometimes called a stricture (as in urethral stricture). Stricture as a term is usually used when narrowing is caused by contraction of smooth muscle (e.g. achalasia, prinzmetal angina); stenosis is usually used when narrowing is caused by lesion that reduces the space of lumen (e.g. atherosclerosis). The term coarctation is another synonym, but is commonly used only in the context of aortic coarctation. Restenosis is the recurrence of stenosis after a procedure. The resulting syndrome depends on the structure affected. Examples of vascular stenotic lesions include: Intermittent claudication (peripheral artery stenosis) Angina (coronary artery stenosis) Carotid artery stenosis which predispose to (strokes and transient ischaemic episodes) Renal artery stenosis The types of stenoses in heart valves are: Pulmonary valve stenosis, which is the thickening of the pulmonary valve, therefore causing narrowing Mitral valve stenosis, which is the thickening of the mitral valve (of the left heart), therefore causing narrowing Tricuspid valve stenosis, which is the thickening of the tricuspid valve (of the right heart), therefore causing narrowing Aortic valve stenosis, which is the thickening of the aortic valve, therefore causing narrowing Stenoses/strictures of other bodily structures/organs include: Pyloric stenosis (gastric outflow obstruction) Lumbar, cervical or thoracic spinal stenosis Subglottic stenosis (SGS) Tracheal stenosis Obstructive jaundice (biliary tract stenosis) Bowel obstruction Phimosis Non-communicating hydrocephalus due to aqueductal stenosis Stenosing tenosynovitis Atherosclerosis Esophageal stricture Achalasia Prinzmetal angina Vaginal stenosis Meatal stenosis alcohol atherosclerosis causes stenotic lesions in arteries. birth defects calcification diabetes headbanging – as in the case of Dave Mustaine iatrogenic, e.g.