Abstract
The blastocyst begins to implant in the endometrium at 3 weeks menstrual age (1 week postconception),1 the first definitive ultrasound sign of pregnancy is the “gestational sac”. Prior to the appearance of the gestational sac, the endometrium is markedly echogenic and the arcuate vessels are somewhat prominent.2 This, however, is nondiagnostic and can often be seen in the normal late secretory phase. In ultrasound images the gestational sac appears as a thick echogenic ring surrounding a sonolucent centre (Figure 34. 1). This sonolucent centre is actually the fluid-filled chorionic sac.2 This sac already contains the amnion, bilaminar embryonic disc and yolk sac, but these structures are too small to be imaged, even with the high magnification of our current endovaginal probes. The echogenic ring is the result of a trophoblastic decidual reaction. Early on the entire chorionic sac is surrounded by chorionic villi (Figure 34. 2). These villi are symmetrically located. Some villi will bud and branch into secondary and tertiary villi, and become chorion frondosum (the forerunner of the placenta). Other primary villi will regress and become chorion leave.
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References
Moore KL (1988) Formation of the bilaminar embryo: the second week. In: Moore KL (ed) The developing human: clinically oriented embryology, 2nd edn. WB Saunders, Philadelphia, PA
Goldstein SR (1991) Pregnancy 1: embryo. In: Goldstein SR (ed) Endovaginal ultrasound, 2nd edn. Wiley-Liss, New York
Cadkin AV, McAlpin J (1984) Detection of fetal cardiac activity between 41 and 43 days of gestation. J Ultrasound Med 3:499
Sauerbrei E, Cooperberg PL, Poland JB (1980) Ultrasound demonstration of the normal fetal yolk sac. J Clin Ultrasound 8:217
Marks WM, Filly RA, Callen PQW et al (1983) The decidual cast of ectopic pregnancy: a confusing ultrasonographic appearance. Radiology 143:223
Romero R, Kadar M, Jeanty P et al (1985) Diagnosis of ectopic pregnancy: value of the discriminatory human chorionic gonadotropin zone. Obstet Gynecol 66:357–360
Bradley WG, Fiske CE, Filly RA (1982) The double sign of early intrauterine pregnancy: use in exclusion of ectopic pregnancy. Radiology 143:223–226
Nyberg DA, Laing FC, Uri-Simmons M et al (1983) Ultrasonic differentiation of the gestational sac of early pregnancy from the pseudogestational sac of ectopic pregnancy. Radiology 146:755–759 9
Yeh HC, Goodman JD, Carr L et al (1986) Intradecidual sign: a US criterion of early intrauterine pregnancy. Radiology 161:463–467
Wilcox AJ, Weinberg CR, O’Connor JF et al (1988) Incidence of early pregnancy loss. N Engl Med 319:189–194
Gilmore DH, McNay MB (1985) Spontaneous fetal loss rate in early pregnancy. Lancet i: 107–109
Wilson RD, Kendrick V, Wittmann BK et al (1986) Spontaneous abortion and pregnancy outcome after normal first trimester ultrasound examination. Obstet Gynecol 67:352–355
Simpson JL, Mills JL, Holms LB et al (1987) Low fetal loss rates after ultrasound-proved viability in early pregnancy. JAMA 258:2555–2557
Goldstein SR, Snyder JR, Watson C et al (1988) Very early pregnancy detection with endovaginal ultrasound. Obstet Gynecol 72:200–204
Fine C, Cartier M, Doubilet P (1988) Fetal heart rates: values throughout gestation. J liltrasound Med 7:S105-S106
Timor-Trisch I, Peisner D, Raju S (1990) Sonoembryology: an organ oriented approach using a high frequency vaginal probe. J Clin Ultrasound 18:286–298
Goldstein SR (1994) Embryonic demise in early pregnancy: a new look at the first trimester. Obstet Gynecol 84:294–298
Hajenius PJ, Mol BW, Ankum WM et al (1995) Suspected ectopic pregnancy: expectant management in patients with negative sonographic findings and low serum hCG concentrations. Early Pregnancy 1:258–262
Kadar N, Bohrer M, Kemmann E et al (1994) The discriminatory human chorionic ganodotropin zone for endovaginal sonography: a prospective, randomized study. Fertil Steril 61:1016–1020
Keith SC, London SN, Weitzman GA et al (1993) Serial transvaginal ultrasound scans and beta-human chorionic gonadotropin levels in early singleton and multiple pregnancies. Fertil Steril 59:1007–1010
Nyberg D, Laing FC, Filly R et al (1983) Ultrasound differentiation of the gestational sac of ectopic pregnancy. Radiology 146:755–759
Rowling SE, Coleman BG, Langer JE et al (1997) Firsttrimester US parameters of failed pregnancy. Radiology 203:211–217
Schmidt-Sarosi C, Schwartz LB, Lublin J et al (1998) Chromosomal analysis of early fetal losses in relation to transvaginal ultrasonographic detection of fetal heart motion after infertility. Fertil Steril 69:274–277
Byrne J, Warburton D, Kline J et al (1985) Morphology of early fetal deaths and their chromosomal characteristics. Teratology 32:297–315
Ohno M, Maeda T, Matsunobo A (1991) A cytogenetic study of spontaneous abortions with direct analysis of chorionic villi. Obstet Gynecol 77:394–398
Robinson HP, Fleming JE (1975) A critical evaluation of sonar “crown rump length” measurements. Br J Obstet Gynaecol 82:702
Goldstein SR, Kerenyi T, Scher J et al (1996) Correlation between karyotype and ultrasound findings in patients with failed early pregnancy. Ultrasound Obstet Gynecol 8:314–317
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Goldstein, S.R. (2003). Early Pregnancy Failure. In: Ultrasound and Endoscopic Surgery in Obstetrics and Gynaecology. Springer, London. https://doi.org/10.1007/978-1-4471-0655-5_34
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DOI: https://doi.org/10.1007/978-1-4471-0655-5_34
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