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Chest, Vol 79, 483-486, Copyright © 1981 by American College of Chest Physicians


ARTICLES

Supernumerary mitral valve producing subaortic stenosis

J Hatem, RM Sade, A Taylor, BW Usher and JK Upshur

A ten-year-old girl with severe subaortic stenosis was found to have relatively mature valvular endocardial cushion tissue (fibromyxomatous sheets with a chorda tendinea attached to a left ventricular papillary muscle) immediately beneath the aortic valve. This structure behaved like a valve mechanism, obstructing the left ventricular outflow tract during ventricular systole. This anomaly is an extreme on the spectrum of obstructive endocardial cushion malformations.


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Copyright © 1981 by the American College of Chest Physicians.