三尖瓣下移畸形是一种少见的先天性心脏发育畸形,其发病率占先心病患者的0.03%~1%。该畸形18%死于新生儿期,50%在2岁之内死亡,因此产前早期诊断极其重要。彩色多谱勒超声的胎儿四腔心切面易于显示,作为产前超声筛查胎儿心脏病的标准切面之一,能够准确诊断胎儿的三尖瓣下移畸形, Tricuspid regurgitation is a rare congenital congenital heart malformations, the incidence of congenital heart disease in patients with 0.03% to 1%. 18% of the deformity died in the neonatal period, 50% died within 2 years of age, so early diagnosis of prenatal is extremely important. Color Doppler ultrasound fetal four-chamber heart section is easy to display, as a prenatal ultrasound screening of fetal heart disease, one of the standard aspects of the accurate diagnosis of fetal tricuspid regurgitation,