左三房心是少见的先天性心脏畸形，本组６例均经手术证实。Ｘ线表现可根据血液动力学的改变，分为肺静脉高压型和肺多血型；亦受隔膜孔的大小及其有无，房水平分流的存在与位置及畸形肺静脉引流的位置所影响。右心造影可显示左房内呈双腔状，中有分隔，近腔大于远腔。并提出与二尖瓣狭窄和房间隔缺损的鉴别。 The third left heart room is a rare congenital heart disease, the group of 6 patients were confirmed by surgery. X-ray findings may be based on hemodynamic changes, divided into pulmonary hypertension and pulmonary pleomorphism; also by the size of the diaphragm hole and its presence, the presence and location of the level shunt and the location of abnormal pulmonary venous drainage affected. Right ventricular angiography can show the left atrium was double-lumen, in the separation, the proximal cavity is greater than the far cavity. And proposed mitral stenosis and atrial septal defect identification.