A<unk>  (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);<unk>  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<unk>  after a procedure.
Stenosis
Dysbiosis
Steatosis
Glandular metaplasia
Hydrodilatation
Intestinal metaplasia
Couching 
Squamous metaplasia