A strong light spot of 0.2cm in the left ventricle during 4D may be a manifestation caused by calcification of the papillary tendon cords or the presence of organic cardiac disease. During pregnancy, if there is a strong light spot of 0.2cm in the left ventricle when pregnant women undergo 4D ultrasound, it may be caused by calcification of the papillary tendon cords due to calcium salt deposition in the papillary tendon cords during the congenital development of the fetus, which may not have any obvious effect on the growth and development of the fetus. Some fetuses present with a 0.2 cm strong light spot in the left ventricle, which may be a manifestation of lesions caused by congenital fetal cardiac developmental anomalies, and termination of pregnancy may be necessary if the condition of the fetus is more serious.