1Gianluigi Pilu, et al. Diagnosis of fetal abnormalities ( The 18 - 23 - week scan) [ M]. Published in the USA by The Parthenon Publishing Group Inc, 1999,73 - 76.
2Nasu K, Matsuki S, et al. Choledochal cyst diagnosed and conservatively treated during prognancy [J]. Am J Perinatol, 2004 Nov, 21 (8) :463-8.
3Chen CP, Tzen CY, Wang W. Pronatal diagnosis of cystic bladder distension secondary to obstructive uropathy[ J]. Prenat Diagn,2000 Mar,20(3) :260 -3.
