中文摘要：

目的 观察二尖瓣主动脉瓣瓣间纤维假性动脉瘤（P-MAIVF）超声心动图特点。方法 结合相关文献，回顾分析6例P-MAIVF的临床特征及超声心动图表现。结果 6例P-MAIVF均位于主动脉瓣根部后方，收缩期膨胀而舒张期塌陷是其特征性表现。6例中，5例合并感染性心内膜炎，1例为心房颤动射频消融并发症，4例合并主动脉瓣二叶畸形，2例假性动脉瘤破入升主动脉。结论 经胸超声心动图是诊断P-MAIVF的首选方法；彩色血流多普勒有助于观察是否有破口形成，三维超声有助于观察病灶与邻近结构的空间位置关系。

英文摘要：

Objective To explore the clinical and echocardiographic features of pseudoaneurysm of mitral-aortic intervalvular fibrosa （P-MAIVF）. Methods Clinical characteristics and transthoracic echocardiographic features of 6 patients with P-MAIVF were retrospectively analyzed compared with relevant literature. Results P-MAIVF located in the posterior aspect of aortic root, which expanded during systole and collapsed during diastole period. Among 6 cases, 5 associated with endocarditis, 1 P-MAIVF occurred secondary to transcatheter radio frequency ablation for treatment of atrial fibrillation, 4 associated with aortic bicuspid, while 2 P-MAIVF ruptured into the ascending aorta. Conclusion Transthoracic echocardiography may be the best tool in diagnosis of P-MAIVF. CDFI can be used to identify the ostium of rupture. Real time three-dimensional transthoracic echocardiography is helpful to determining the relationship of P-MAIVF and adjacent anatomic structures.