1Gronnum P, et al. Assessment of fetal kidney size in normal gestation by comparison of ratio of kidney circumference to abdominal circumference[ J]. Am J Obstet Gyencol , 1980,136:249 -254.
2Gronnum P,Bracken MR,Siverman R,Hohbiin STC.Assessment of fetal kidney size in normal gestation by comparison of ratio of kidney circumference to abdominal circumference.Am J Obstet Gyencol,1980,136:249 ～254
3Grignon A.Urinary tract dikatation in utero:classfication and clinical applications.Radiology,1986,160 (3):645
4Holzqgreve W,Aydinli K,Bvans M et al.Prental diagnosis and management of fetal genitourinary tract abnormalities.In:Asimk,ed.An atlas of ultrasonography in obstetrics and ganecology.New Zerey:The paithenon publishing,Grop,1992:61～79
