An asymptomatic 59-year-old man was referred to the outpatient clinic with a right bundle branch block and left anterior hemiblock. Physical examination revealed no abnormalities. The echocardiogram showed a large mobile mass in the right ventricle (Panel A and Supplementary dataSupplementary data online, Video S1). There were no signs of pericardial effusion, the right ventricular (RV) and left ventricular function were normal.

中文翻译：

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右心室神秘包块。

无症状的59岁男性被转诊至门诊，其右束支传导阻滞和左前半阻滞。体格检查未发现异常。超声心动图显示右心室有较大的活动块（图A和在线补充数据，视频S1）。没有心包积液的迹象，右心室（RV）和左心室功能正常。