Accessory Mitral Valve Tissue
Accessory mitral valve tissue (AMVT) is an extremely rare congenital cardiac anomaly of embryologic development and growth of the endocardial cushion first described by McLean in 1963. The incidence of this anomaly is unknown. It is an unusual cause for subvalvular left ventricular outflow tract (LVOT) obstruction. The common clinical presentations are due to LVOT obstruction [1–3].
KeywordsAccessory mitral valve tissue (AMVT) Left ventricular outflow tract obstruction (LVOTO) Echocardiography Endocardial cushion
Parasternal long axis view showing a highly mobile redundant tissue attached to the mitral valve (MV) suggestive of accessory tissue mitral valve (ATMV) (WMV 606 kb)
Large redundant accessory tissue mitral valve (ATMV) may appear as a cystic mass in transesophageal echocardiography (WMV 419 kb)
Accessory tissue mitral valve (ATMV) in long axis view of transesophageal echocardiography (WMV 438 kb)
- 8.Garrett HE, Spray TL. Accessory mitral valve tissue (an increasingly recognized cause of left ventricular outflow tract obstruction). J Cardiovasc Surg (Torino). 1990;31:225–30.Google Scholar