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Ann Thorac Surg 2004;77:713-715
© 2004 The Society of Thoracic Surgeons

Case report

Accessory mitral valve tissue causing severe left ventricular outflow tract obstruction in an adult

Yoshikazu Aoka, MDa*, Naoko Ishizuka, MD, PhDa, Yasunari Sakomura, MD, PhDa, Hirotaka Nagashima, MD, PhDa, Masatoshi Kawana, MD, PhDa, Akihiko Kawai, MD, PhDb, Hiroshi Kasanuki, MD, PhDa

a Department of Cardiology, The Heart Institute of Japan, Tokyo Women's Medical University, Tokyo, Japan
b Department of Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical University, Tokyo, Japan

Accepted for publication April 9, 2003.

* Address reprint requests to Dr Aoka, 8-1 Kawada-cho Shinjuku-ku, Tokyo 162-8666, Japan
e-mail: maoka{at}hij.twmu.ac.jp

Accessory mitral valve (AMV) is a rare cause of left ventricular outflow tract (LVOT) obstruction and is extremely rare in adults. We report a case of an older adult with an AMV that caused severe LVOT obstruction. A parachute-like piece of tissue (the AMV) protruding into the LVOT during systole was first detected in a 45-year-old woman by echocardiography. Because the pressure gradient and dyspnea gradually progressed, she finally underwent a successful operation for removal when she was 48 years old.




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