1. TV-CDS of early intrauterine pregnancy
TV-CDS of early intrauterine pregnancy. A: Diagram showing arterial and venous flow to the choriodecidua. The arcuate vessels branch into the radials, which traverse the myometrium ending in the spiral vessels within the choriodecidua. B: (Top) Diagram of changes in spiral arterioles and accompanying veins at 8 weeks, 16 weeks, 20 weeks, 32 weeks, and full term. The side bar indicates relative size/depth of endometrial/decidualized choriodecidua/placenta relative to myometrium. (Bottom) Diagram of placental vessels in third trimester. C: TV-CDS of a normal 5-week IUP showing flow in the arcuate vessels and a form within the choriodecidua adjacent to the chorionic sac. D: TV-CDS showing low impedance arterial flow within the choriodecidua in same patient as in (C). E: TV-CDS of abnormal or failed IUP. F: TV-CDS showing increased venous flow between choriodecidua and myometrium. G: TV-CDS of failed IUP with circumferential subchorionic hemorrhage. H: TV-CDS of embryonic demise showing high-velocity venous flow. I: TV-CDS of embryonic demise with increased subchorionic venous flow. J: Retained products of conception showing hypervascular area. K: Six-week fetus with heart blood flow. L: Seven-week IUP with flow within developing fetus and adjacent choriodecidua. M: Eight-week fetus showing flow in both right and left ventricles. N: Eight-week IUP showing absent diastolic flow in umbilical arteries. O: Same as (N) at 10 weeks. P: Flow within developing decidua basalis. Q: Flow within myometrium adjacent to placenta in 11-week IUP. (Courtesy of C. Peery, MD.) R: Cerebral blood flow in a 12-week fetus. S: Cerebral blood flow in major intracranial arteries in a 13-week fetus. T: Same as (S) showing internal carotid. U: TV-CDS showing physiologic herniation of bowel adjacent to cord.
Source: TRANSVAGINAL SONOGRAPHY OF EARLY INTRAUTERINE PREGNANCY, Sonography in Obstetrics and Gynecology: Principles & Practice, 7e
Citation: Fleischer AC, Toy EC, Lee W, Manning FA, Romero RJ. Sonography in Obstetrics and Gynecology: Principles & Practice, 7e; 2014 Available at: Accessed: October 23, 2017
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