病人男性,20岁,从无心脏异常病史,家族无心脏病史,因体格检查时胸骨左缘有收缩期杂音,做超声心动图。病人体温37℃,血压120/80mmHg,心率72次/min。超声心动图检查,可见四腔心及纵轴二尖瓣前叶有囊状附着物(图1)。眼底、四肢无出血点。问:诊断是什么?病例98:无症状超声心动图二 Male patient, 20 years old, from no history of cardiac abnormalities, family history of heart disease, systolic murmur at the left margin of the sternum for physical examination, echocardiography. Patient temperature 37 ℃, blood pressure 120 / 80mmHg, heart rate 72 beats / min. Echocardiography, showing four-chamber heart and longitudinal mitral valve anterior cystic attachment (Figure 1). Fundus, limbs without bleeding point. Q: What is the diagnosis? Case 98: Asymptomatic echocardiography II