Accessory mitral valve tissue

A congenital non-syndromic heart malformation characratized by an accessory mitral valve leaflet or various accessory mitral valve structures. It may be asymptomatic or present at various ages with symptoms of left ventricular outflow tract obstruction, low cardiac output due to subaortic obstruction or congestive heart failure. In some cases, it may be a source of cardioembolism. The malformation may be isolated or associated with other congenital heart malformations.

Heart murmur

An extra or unusual sound heard during a heartbeat caused vibrations resulting from the flow of blood through the heart.

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PMID (PMCID)
10522797	FEMALE	Infant, Newborn
	Accessory mitral valve tissue causing severe subaortic stenosis with dextrocardia in a premature newborn.
	Bilal MS, Oztunc F, Besikci R, Bilal S, Ozkara A, Olga R. Thorac Cardiovasc Surg. 1999;47(4):252-5.
	We report an unusual case of left-ventricular outflow obstruction caused by accessory mitral valve tissue associated with dextrocardia and ventricular septal defect in a seven-day-old, 2200 grams premature infant, who was referred with a heart murmur.