Ultrasound fetal left ventricular focal strong echoes are caused by calcification of the papillary muscle, generally not dangerous, if it is caused by chromosomal abnormalities, generally more dangerous. B ultrasound fetal left ventricular focal strong echoes, may be the heart within the papillary muscle tendon cords calcification, is a physiological phenomenon, for isolated left ventricular strong light echoes, in general, there is no danger, usually do a good job of pregnancy and obstetrics to observe. Ultrasound fetal left ventricle focal strong echo is dangerous may be caused by chromosomal abnormalities, to consider a congenital heart malformation, need to go to the hospital further to do amniocentesis examination, to understand the fetal chromosomes and genes are normal, if there is a serious chromosomal abnormality, such as trisomy 21, it is recommended that induced abortion to go to the termination of pregnancy treatment, this situation is dangerous. Pregnant women should follow the doctor’s instructions to do a good maternity test. If fetal abnormality is found, it is recommended to go to the regular hospital as soon as possible for eugenic counseling and follow the doctor’s instructions for treatment.