On stenotic annular thickening of the endocardium

In addition to frequently occurring diffuse thickenings of the parietal endocardium, limited fibrous thickenings of the parietal endocardium - endocardial mosaics - are also well known. The latter are limited thickenings, often with depressions, so-called "pockets". Most authors explain the occurrence of these blisters as a result of hitting the inner surface of the heart with an incorrectly moving blood wave, but the method of their formation has not yet been finally elucidated.