Asymptomatic and isolated accessory mitral valve tissue in adult population: three case reports and review of the literature

H. Cil, Z.A. Atilgan, Y. Islamoglu, C. Yavuz, E.Ö. Tekbas

Department of Cardiology and *Department of Cardiovascular Surgery, School of Medicine, Dicle University, Diyarbakir, Turkey. habibcil@hotmail.com

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• Cardiology

Accessory mitral valve tissue is a rare congenital cardiac anomaly and commonly it may cause left ventricular outflow tract obstruction (LVOTO). This anomaly occurs as a part of other congenital cardiac anomalies. However, it may be seen isolated. Structures in LVOT such as tumor, vegetation, cysts may have attention for differential diagnosis. The number of cases is increasing with the routinely using of two-dimensional echocardiography.

Accessory mitral valve tissue is detected first early in children with symptoms of LVOT and is very rarely diagnosed in adults. One third of cases may asymptomatic, but commonly significant left ventricular outflow tract gradient can be detected in these cases, especially adult period. Optimal treatment of this anomaly is surgery if there is a significant LVOTO.
In this report, we presented the three asymptomatic adult cases with accessory mitral valve tissue, without increased gradient in LVOT.  Surgical excision was recommended to the first case in another hospital with diagnosis of cardiac cyst. Two cases are presented.

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