TY - JOUR T1 - Dynamic changing mass behind the left atrium JF - Heart JO - Heart SP - 1583 LP - 1583 DO - 10.1136/hrt.2006.107136 VL - 93 IS - 12 AU - S Buss AU - H A Katus AU - D Mereles Y1 - 2007/12/01 UR - http://heart.bmj.com/content/93/12/1583.abstract N2 - An 85-year-old woman was examined at the echocardiography laboratory during a predischarge examination after an uncomplicated, circumscribed acute myocardial infarction.An undefined liquid-containing mass (*) was observed behind the left atrium (LA), with no evidence of … ER -