Transvaginal sonography in the first trimester: embryology, anatomy, and hCG correlation.
Department of Radiology, University of Michigan Medical Center, Ann Arbor.
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D006063:Chorionic Gonadotropin / Q000097:blood*; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D011261:Pregnancy Trimester, First; D014463:Ultrasonography
D006063:Chorionic Gonadotropin