Left Ventricle Outflow Obstruction by Reverse-Oriented Tricuspid Semilunar Valve-Like Endocardial Duplicatures

Figure 3

The valve-like structure was composed of fibrillary material with staining properties of fine fibrillary collagen (asterisk) stained with trichrome (a) and methenamine silver impregnation (b), with scattered very fine elastic fibers stained with orcein (c, d); the anchorage of the valve-like structure was on a thickening of the adjacent endocardium with a coarse compact layer of elastic fibers (arrow, c, d). Normal aortic valve leaflet is underlayed on the ventricular aspect by a continuous thick layer of elastic fibers (e, f, large arrow) separating into thinner subunits (orcein). 25x (a, b, c, e). 100x (d, f).

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