Figure 20.1.1Twins at 5.0 weeks diagnosed by counting gestational sacs. A: Sagittal view of the uterus demonstrates two gestational sacs (arrows). No yolk sac or embryo is identifiable within either…
Figure 17.1.1Cervical length measurement. A: Transabdominal measurement (calipers) when the internal os (arrow) is closed (i.e., no funneling). B: Transvaginal measurement (calipers) when the internal os (long arrow) is open…
Figure 19.1.1Cross section of two-vessel umbilical cord. A: Image of cord surrounded by amniotic fluid demonstrating two vessels. The larger one is the umbilical vein (arrow) and the smaller is…
Figure 31.1.1Transvaginal ultrasound-guided aspiration of a unilocular cyst. A: Transvaginal view of the right adnexa demonstrates a simple unilocular cyst (arrows). There is a needle guide on the transducer, and…
Figure 21.1.1Twin–twin transfusion syndrome. The two fetal abdomens differ in size, one smaller (short arrow) than the other (long arrow), indicating discordant growth. The thin intertwin membrane (arrowheads) lies close…
Figure 3.1.1Umbilical cord insertion into placenta. The umbilical cord appears as a thin-walled curvilinear structure (arrow) extending from its insertion site into the placenta (arrowhead), in grayscale (A) and color…
Figure 22.1.1Ultrasound-guided amniocentesis. Ultrasound has been used to guide a needle (arrowheads) into the amniotic fluid. Figure 22.1.2Continuous sonographic monitoring of fetal movement during amniocentesis. A fetal hand (arrow) is…
