Double-orifice mitral valve

A rare, congenital, non-syndromic heart malformation characterized by a single fibrous annulus with two orifices opening into the left ventricle. Clinical presentation is variable and related to the degree of resulting mitral insufficiency and/or stenosis, and depending on the associated heart disease, most commonly atrioventricular septal defect, obstructive left-sided lesions, and cyanotic heart disease. Rare cases of isolated disease have been reported.