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目的：分析孤立性二尖瓣瓣上狭窄环的影像学特征。材料与方法：３例婴儿二尖瓣瓣上狭窄环病例均进行胸部平片、超声心动图检查，其中２例行心血管造影检查。结果：（１）胸片显示肺静脉高压；（２）胸骨旁及心尖长轴位心动超声图确定左房内异常隔膜形成的回声增强亮带；（３）选择性肺动脉造影或左房造影清楚地证实左房内的隔膜影；（４）４支肺静脉及左心耳均位于左房隔膜上腔内。结论：超声心动图是诊断本病的首选方法，对于复杂的病例应进行心血管造影
Objective: To analyze the imaging features of the stenosis ring in isolated mitral valve. MATERIALS AND METHODS: Thoracic films and echocardiography were performed in 3 cases of infantile mitral valve stenosis rings. Two of them were examined by cardiovascular angiography. Results: (1) chest radiograph showed pulmonary venous hypertension; (2) parasternal and apical long axis echocardiography to determine the left atrial septal abnormalities enhanced echogenic band; (3) selective pulmonary angiography or left atrial imaging clearly confirmed Left atrial septum shadow; (4) 4 pulmonary veins and left atrial appendage are located in the left atrial septum. Conclusion: Echocardiography is the preferred method of diagnosis of the disease, for complex cases should be carried out by cardiovascular angiography