For cor triatriatum the location of septum,the size of orifice,the relation with pulmonary vein,and the integrity of atrial septum can be displayed more dearly and directly by MTEE than by TTE.

• MTEE对三房心的隔膜位置、开口大小、与肺静脉的关系、房间隔是否完整等的显示较TTE更为直观和逼真。