Ultrasound examination during pregnancy test shows strong light dots in the left ventricle, which are dotted strong echoes in the fetal ventricle and are only a sonogram, and cannot indicate the presence of cardiovascular malformations, let alone be used as a diagnosis of heart disease. The mechanism of the occurrence of intraventricular strong echo is not well understood and may be related to intraventricular tendon thickening, mineral deposition in the central papillary muscle, and incomplete perforation of the papillary tendon cords, and there is no clear relationship between fetal intraventricular strong light spot and fetal congenital heart malformation and other non-chromosomal malformations.