Prenatal ultrasound diagnosis offetal perineallipoblastoma: a case reportYujie Zhang1*, Chao Sun21Department of Ultrasound, Weifang People’s Hospital, Weifang, P.R. China.2Department of Neurology, Weifang People’s Hospital, Weifang, P.R. China.*Corresponding author : Yujie Zhang (Address: Department of Ultrasound, Weifang People’s Hospital, Weifang City 261041, P.R. China; Telephone number: +86 15318914825; Email:119282738@qq.com)