Aortic stenosis is a relatively uncommon valvular condition, according to Bell,1 and is usually produced by the ravages of rheumatic fever. Occasionally, it may be of congenital origin, the valve being fused into a tiny megaphone-like shape or cone similar to the condition found in congenital pulmonary valvular stenosis. On other occasions it may be seen as the end result of arteriosclerotic changes in the root of the aorta. It should not be confused with congenital subaortic stenosis, which is a less serious clinical condition analogous in some respects to congenital infundibular stenosis of the right ventricular outflow tract. Reich2 feels that the arteriosclerotic form of aortic stenosis is fairly common. Here, the fibrosis and calcification begin in the aortic wall and involve the entire valve structure, producing a replacement with rigid tissue. Often, there is no fusion of the valve commissures in such patients, each rigid leaflet
Bailey CP, Ramirez HPR, Larzelere HB. SURGICAL TREATMENT OF AORTIC STENOSIS. JAMA. 1952;150(17):1647–1652. doi:10.1001/jama.1952.03680170001001
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