【名词&注释】
门静脉(portal vein)、肺动脉(pulmonary artery)、肺静脉异位引流(anomalous pulmonary venous drainage)、右心房(right atrium)、肺静脉回流(pulmonary venous connection)
[单选题]心内型肺静脉异位引流在超声上主要表现是
A. 肺静脉回流(pulmonary venous connection)到下腔静脉
B. 肺静脉回流(pulmonary venous connection)到上腔静脉
C. 肺静脉直接回流到主动脉
D. 肺静脉回流(pulmonary venous connection)到冠状窦
E. 肺静脉直接回流到肺动脉