RT Journal Article SR Electronic T1 Blood filled cyst of the papillary muscle of the mitral valve producing severe left ventricular outflow tract obstruction. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 132 OP 133 DO 10.1136/hrt.63.2.132 VO 63 IS 2 A1 Arnold, I R A1 Hubner, P J A1 Firmin, R K YR 1990 UL http://heart.bmj.com/content/63/2/132.abstract AB A 46 year old man was found to have left ventricular outflow obstruction caused by a blood-filled cyst attached to the anterior papillary muscle of the mitral valve. It was successfully excised.