Transvaginal sonographic imaging of the low fetal head in the second trimester.
Benacerraf
B R
BR
Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, Massachusetts.
Estroff
J A
JA
D000328:Adult; D005260:Female; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D007746:Labor Presentation; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D014159:Transducers; D014463:Ultrasonography / Q000379:methods*