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  • Title: Accessory mitral valve tissue that caused a left ventricular outflow tract obstruction: a case report.
    Author: Tennichi T, Taniguchi T.
    Journal: JA Clin Rep; 2019 Dec 30; 5(1):86. PubMed ID: 32026030.
    Abstract:
    BACKGROUND: Accessory mitral valve tissue (AMVT) is a rare congenital cardiac anomaly and is usually diagnosed in childhood. The diagnosis of AMVT in adulthood is extremely rare. We present a case report on an adult patient with AMVT that caused a left ventricular outflow tract (LVOT) obstruction. CASE PRESENTATION: A 51-year-old man was diagnosed with AMVT via transesophageal echocardiography, which resulted in an LVOT occlusion (mean gradient 12 mmHg) during systole. Resection of the AMVT was performed under general anesthesia. The patient was hemodynamically stable throughout the surgery and post-operation. There was no abnormity of the mitral valves, including mitral regurgitation. CONCLUSIONS: Although a very rare malformation, particularly in adults, AMVT can cause LVOT obstruction. Examination of the mitral valve using transesophageal echocardiography is important to understand the severity of LVOT obstruction.
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