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Ann Thorac Surg 1996;62:1858-1860
© 1996 The Society of Thoracic Surgeons

Case Report

Subaortic Stenosis Caused by Anomalous Papillary Muscle of the Mitral Valve

Yutaka Imoto, MD, Hideaki Kado, MD, Hiroyuki Yasuda, MD, Ryuji Tominaga, MD, Hisataka Yasui, MD

Division of Cardiovascular Surgery, Kyushu University, and Department of Cardiovascular Surgery, Fukuoka Children's Hospital, Fukuoka, Japan

Accepted for publication June 21, 1996.

We report on a rare case of subaortic stenosis caused by an anomalous posteromedial papillary muscle inserting directly into the anterior mitral leaflet, which had muscular extension to the subaortic region. Resection of the muscular extension alone was ineffective. A second operation including entire resection of the anomalous papillary muscle and mitral valve replacement resulted in successful relief of the obstruction. Microscopic findings of the resected tissue were compatible with those of hypertrophic cardiomyopathy.




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