[Echographic characteristics of the early stages of pregnancy using a gray scale attachment].
D002823:Chorion; D004626:Embryology; D005260:Female; D006801:Humans; D010048:Ovarian Cysts / Q000175:diagnosis; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography; D015053:Zygote
Ekhograficheskaia kharakteristika rannikh srokov beremennosti s ispol'zovaniem seroĭ shkaly.