[Vaginal sonography in the 1st trimester. I. Qualitative parameters].
To establish exact data about the ultrasound image of early pregnancy and the detection rate of relevant structures, the vaginosonographic examinations of 259 normal intrauterine singleton pregnancies with reliable dates between 4 and 13 complete weeks menstrual age were analysed. The chorionic cavity as the first specific structure of pregnancy, was imaged in all cases. The chorion frondosum could be differentiated from the chorion laeve at 6/7 weeks. The yolk sac was reliably seen at 5 weeks. The embryo and its heart activity proving viability of pregnancy, were regularly found at 6 weeks. At 7 weeks the amnion was seen separately from the embryo. At 7/8 weeks its cranial pole and the umbilical cord were reliably identified. At 8/9 weeks the extremities as well as body movements were visible. Vaginal sonography is a valuable tool to examine early pregnancy and to prove its normal development. Visualization of the sequentially appearing structures may be also helpful to estimate gestational age.
Rempen
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Universitäts-Frauenklinik Würzburg.
D000022:Abortion, Spontaneous / Q000000981:diagnostic imaging*; D000650:Amnion / Q000000981:diagnostic imaging; D002823:Chorion / Q000000981:diagnostic imaging; D005314:Embryonic and Fetal Development; D005260:Female; D005328:Fetal Viability / Q000502:physiology; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011271:Pregnancy, Ectopic / Q000000981:diagnostic imaging*; D011272:Pregnancy, Multiple / Q000502:physiology; D016216:Ultrasonography, Prenatal
Vaginale Sonographie im ersten Trimenon. I. Qualitative Parameter.