Objective To observe the prenatal ultrasonic manifestations and outcomes of fetal spinal cord terminal central duct dilation.Methods Data of 8 fetuses with spinal cord terminal central duct dilation detected with prenatal ultrasound were retrospectively analyzed,and the ultrasonic manifestations and outcomes were observed.Results Prenatal ultrasound showed varying degrees of spinal cord terminal central duct dilation in all 8 fetuses.The cystic dilation area disappeared spontaneously in 4 fetuses,gradually increased in 1 fetus,continued to exist without significant changes in 1 fetus,the echo at the end of the expansion zone gradually changed from good sound transmission to uneven in 1 fetus,and the cystic expansion structure disappeared and the central duct end enlarged as a whole in third trimester in 1 fetus.Among 8 newborns,no significant abnormality was detected with physical examination in 6 cases,including 1 case of 1-month-old MRI showed fatty filum terminale and 1 case of 3-month-old MRI showed spinal canal cyst and fatty filum terminale,the other 2 cases were diagnosed as tethered cord syndrome and filum terminale fibrolipoma with physical examination and MRI.Conclusion Prenatal ultrasonic manifestations of fetal spinal cord terminal central duct dilation included cystic hypoechoic area of the spinal cord cone and adjacent structures,with clear boundaries and good sound transmission.However,the outcomes of fetal spinal cord terminal central duct dilation were somewhat different.