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Topic: Gestational sac

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	1st Trimester Ultrasound Scanning
		While a gestational sac is sometimes seen as early as during the 4th week of gestation, it may not be seen until the end of the 5th week, when the serum HCG levels have risen to 1000-1500 mIU.
		Gestational sac size may be determined by measuring the largest diameter, or the mean of three diameters.
		Between the 11th and end of the 13th week of gestation, the measurement of nuchal translucency is obtained with the fetus in saggital section and a neutral position of the fetal head (neither hyperflexed nor extended, either of which can influence the nuchal translucency thickness).
	www.brooksidepress.org /Products/Military_OBGYN/Ultrasound/1st_trimester_ultrasound_scannin.htm (2358 words)

	Basic Imaging > Ultrasound of Early Pregnancy
		As the Gestation enlarges, the portion of the chorionic trophoblast destined to form the placenta enlarges and remains in intimate apposition to the underlying decidua (decidua basalis).
		The presence of fluid in the canal in ectopic gestation carries the risk of mis-identification as an intrauterine pregnancy, and is referred to as a pseudogestational sac.
		Gestational Sac first appears in the substance of the decidua (intradecidual) at 4.5 weeks, and should be seen in virtually all normal 5 week intrauterine pregnancies.
	radiology.creighton.edu /pregnancy.htm (3599 words)

	Obstetric ultrasound -- a comprehensive guide to ultrasound scans in pregnancy
		Such measurements form the cornerstone in the assessment of gestational age, size and growth in the fetus.
		The gestational sac can be visualized as early as four and a half weeks of gestation and the yolk sac at about five weeks.
		First trimester ultrasonic 'soft' markers for chromosomal abnormalities such as the absence of fetal nasal bone, an increased fetal nuchal translucency (the area at the back of the neck) are now in common use to enable detection of Down syndrome fetuses.
	www.ob-ultrasound.net (3712 words)

	Human Reproduction, Lectures: Clinical Radiology
		Gestational age is based on age from conception and therefor usually lags menstrual age by 2 weeks.
		Gestational Sac : The first structure seen with ultrasound, the gestational sac can be visualized as early as 4.5 weeks by transvaginal technique.
		A normal gestational sac is round or oval and is located within the fundus or mid portion of the uterus.
	library.med.utah.edu /kw/human_reprod/lectures/clin_radiology (1784 words)

	The Umbilical Cord – The First Lifeline
		The cord develops from the yolk sac, which is one of the first elements seen during pregnancy and is found in the gestational sac.
		The gestational sac is the first available structure of an actual pregnancy and is what doctors look for during an initial ultrasound.
		The yolk sac is what identifies a true gestational sac, and thus is the first actual sign of detectible life.
	www.cordplan.com /en/umbilical-cord.html (617 words)

	Transvaginal sonography in the evaluation of normal early pregnancy: correlation with HCG level -- Bree et al. 153 (1): ...
		The presence and size of the gestational sac, presence of a yolk sac, and identification of embryonic heart activity were correlated with the level of HCG.
		Sac size was correlated with yolk sac and heart activity and the three parameters correlated with gestational age in days.
		When correlating sac size with structures within the sac, a yolk sac was first seen in a gestational sac between 6 and 9 mm and a heartbeat seen in every patient with a 9-mm or greater gestational sac diameter.
	www.ajronline.org /cgi/content/abstract/153/1/75 (531 words)

	Ultrasound - Online CME Courses (Site not responding. Last check: )
		Yolk Sac The yolk sac has a role in the transfer of nutients to the embryo during the second and third weeks while the uteroplacental circulation is developing.
		The understanding of the embyogenesis of the placenta, cord, yolk sac, and fetal membranes is important for the sonographer to evaluate the growth of the embryo and the placenta.
		During the first trimester of pregnancy, the gestational sac should be evaluated with an endovaginal transducer to adequately define the amniotic and chorionic membranes, the yolk sac, the placental development, and the embryo.
	www.gehealthcare.com /twzh/rad/us/education/msucmepl.html (4079 words)

	Human Reproduction, Lectures: Clinical Radiology
		Gestational age is based on age from conception and therefor usually lags menstrual age by 2 weeks.
		Gestational Sac : The first structure seen with ultrasound, the gestational sac can be visualized as early as 4.5 weeks by transvaginal technique.
		A normal gestational sac is round or oval and is located within the fundus or mid portion of the uterus.
	www-medlib.med.utah.edu /kw/human_reprod/lectures/clin_radiology (1784 words)

	Gestational sac (Site not responding. Last check: )
		The discovery of increased amniotic fluid in the gestational sac of one twin and decreased amniotic fluid in the amniotic sac of the second twin should...
		The "yolk sac" is a tiny cystic structure that is present within the gestational sac of a healthy embryo.
		gestational sac identified in the cervix (distinguished from a cervical ectopic...
	www.republika.pl /belstar/glucose/gestationalsac.html (773 words)

	Ultrasound Sonogram Scans week by week first trimester month 1 2 3 - Baby2see.com
		While a gestational sac is sometimes seen as early as during the 4th week of gestation, it may not be seen until the end of the 5th week, when the serum hCG levels have risen to 1000 -1500 mIU.
		The yolk sac (small white circle at upper left of sac) is a source of nutrients for fetus.
		One gestational sac is seen with 2 yolk sacs visible inside it Identical (monozygotic) twins.
	baby2see.com /development/ultrasound_sonogram/first_trimester_scans.html (601 words)

	Double bleb sign in the first trimester of pregnancy. (Site not responding. Last check: )
		Major criteria for an abnormal gestational sac using TAS is defined as failure to identify an embryo in a gestational sac with a MSD of 25 mm or failure to identify a yolk sac with an MSD of 20mm.
		The yolk sac is the first structure to be seen within the gestational sac and should always be visualized with EVS with a mean gestational sac diameter (MSD) of 8mm; and with TAS should be visualized with a MSD of 20 mm.
		Identification of the yolk sac within the early gestational sac is diagnostic of an intrauterine pregnancy.
	brighamrad.harvard.edu /Cases/mcr/hcache/314/full.html (500 words)

	COEM....Concepts Of Environmental Medicine
		Very early in the first trimester, the echolucent gestational sac is mainly filled by the extraembryonic coelom and the small fetal pole is really the embryo, the yolk sac and the tiny amniotic sac.
		Ectopic pregnancies may be suspected by noting no intrauterine gestational sac in the face of a sufficiently elevated serum beta-HCG, or may be diagnosed on ultrasound with the visualization of a gestational sac in an extrauterine location.
		Twin gestations in the first trimester may be classified as to the number of chorions and amnions involved in the pregnancy and thus, some idea of mono- or dizygosity emerge.
	www.coem.com /pre-slide.asp (1238 words)

	Concerns Regarding early Fetal Development : American Pregnancy Association
		Gestational age is the age of the pregnancy from the last normal menstrual period (LMP), and fetal age is the actual age of the growing baby.
		If your doctor is concerned about miscarriage, blighted ovum, or ectopic pregnancy, the gestational sac and fetal pole (if visible) will be measured to determine what type of development should be seen.
		The guideline is that if the gestational sac measures >16-18mm with no fetal pole or the fetal pole measures 5mm with no heartbeat (by vaginal ultrasound), then a diagnosis of miscarriage or blighted ovum is made.
	www.americanpregnancy.org /pregnancycomplications/earlyfetaldevelopment.htm (1914 words)

	UpToDate Prenatal assessment of gestational age and fetal weight
		— The two clinical methods of gestational age assessment are history, using the date of the last menstrual period to calculate the estimated date of delivery ("due date" or EDD), and physical examination.
		The clinical assessment of gestational age or duration of pregnancy thus reflects the "menstrual age".
		The size - gestational age correlation is learned by experience and can be described in terms of fruit (eg, 6 to 8 week size = small pear, 8 to 10 week size = orange, 10 to 12 week size = grapefruit).
	patients.uptodate.com /topic.asp?file=antenatl/14490 (558 words)

	The Normal Gestational Sac
		Small gestational sac prior to visualization of the yolk sac or embryo.
		The gestational sac implants and is surrounded by a decidual reaction.
		Gestational sac diameter versus gestational age (Graph) – Daya et.al.
	www.fetalultrasound.com /online/text/3-034.htm (403 words)

	Early Options: Ultrasound Imaging in Early Pregnancy
		After the gestational sac, the next gestational milestone to appear is the extraembryonic yolk sac.
		An experienced sonographer can detect a yolk sac with transvaginal ultrasound when the gestational sac has reached a mean diameter of 8 mm to 10 mm.
		The presence of a yolk sac confirms the diagnosis of an intrauterine pregnancy and excludes ectopic pregnancy, except in rare cases of simultaneous intrauterine and extrauterine gestations.
	www.prochoice.org /education/cme/online_cme/m4ultrasound.asp (1483 words)

	Glossary of Terms
		The gestational carrier usually has a contractual obligation to return the infant to its intended parents.
		Pregnancy documented by the presence of a gestational sac on ultrasound.
		A technique used in ART for visualizing the follicles in the ovaries and the gestational sac or fetus in the uterus.
	www.fertility-docs.com /glossary.phtml (1226 words)

	Molar Pregnancy and Gestational Trophoblastic Disease - New Treatments, May 2, 2007
		Gestational trophoblastic tumor extends outside uterus but is limited to genital structures with one risk factor.
		Gestational trophoblastic tumor extends outside uterus but is limited to genital structures with two risk factors.
		Gestational trophoblastic tumor extends to lungs with or without genital tract involvement and with one risk factor.
	www.ccspublishing.com /journals4a/gestational_trophoblastic.htm (1005 words)

	Relationship of small gestational sac-crown-rump length differences to abortion and abortus karyotypes -- Dickey et al. ...
		Small gestational sac syndrome (gestational sac diameter minus crown-rump length less than 5 mm) occurred in 1.9% of pregnancies scanned with vaginal ultrasound 37-65 days after the first day of the last menstrual period.
		The rate of fetal death was 80.0% when the gestational sac diameter-crown-rump length difference was less than 5 mm, 26.5% when the difference was 5-7.9 mm (P less than.002 compared with less than 5 mm), and 10.6% when the difference was 8 mm or more (P less than.0001 compared with less than 5 mm).
		Small gestational sac syndrome was present before fetal death in 10.7% of all cases, and in 24% in which the karyotype was normal.
	www.greenjournal.org /cgi/content/abstract/79/4/554 (370 words)

	Ultrasound markers useful in determining early pregnancy viability: don't rely on [beta]-HCG levels - Obstetrics OB/GYN ... (Site not responding. Last check: )
		By 42 days' gestation a 2- to 3-mm gestational sac should be visible in the uterus on ultrasound.
		By the time the sac is 10 mm in diameter, you should see the double decidual sac sign--the gestational sac with inner and outer echogenicity.
		Obstetric textbooks suggest a range of sac sizes for the first two signs: no yolk sac in a 6- to 13-mm gestational sac or no embryonic pole in a 16- to 25-mm gestational sac.
	www.findarticles.com /p/articles/mi_m0CYD/is_16_38/ai_107275721 (637 words)

	NGC - NGC Summary
		The yolk sac is seen as a separate ring-like structure in the amniotic sac (Timor-Tritsch, Farine, and Rosen, 1988; Bernaschek, Rudelstorfer, and Csaicsich, 1988).
		The gestational age corresponding to the obtained measures is given in tables that are programmed in to many ultrasound devices.
		In this investigation, the gestational sac is divided into four equal-sized blocks, and the deepest pocket in each block is measured.
	www.guideline.gov /summary/summary.aspx?doc_id=6540 (2333 words)

	Early Pregnancy Monitoring - Main Line Fertility
		When we are worried that a patient might have a pregnancy in her fallopian tube (ectopic pregnancy), we will perform an ultrasound to see whether a gestational sac is in the uterus.
		Alternatively, it may be too early in the pregnancy for the gestational sac to show up; or, a poorly growing pregnancy (destined to miscarry) may be in the uterus.
		If a gestational sac grows large but does not contain a yolk sac, it is termed an empty sac.
	www.mainlinefertility.com /resources/earlypregnancy.html (967 words)

	Self Eval Section 4
		The earliest gestational age (menstrual weeks) at which it can be said that the yolk sac should be always visible with transvaginal ultrasound is:
		A) Since the yolk sac is present, the nonvisualization of the fetal pole indicates an anembryonic gestation.
		C) The cystic structure adjacent to the fetal pole is the yolk sac.
	www.obgyn.ufl.edu /ultrasound/MedinfoVersion/sec4/exam/se4.html (753 words)

	other fetal measurements (Site not responding. Last check: )
		As the sac is not usually round, an average of the length, width and depth is made.
		Before placental circulation is established, the yolk sac is the primary source of exchange between the embryo and the mother.
		On the other hand, results from such ratios may be misleading as for example the ratio may appear normal in a growth-retarded fetus when both the limbs and the abdomen are affected to such a degree that both are shrunken.
	www.ob-ultrasound.net /omeasure.html (508 words)

	Blighted Ovum or Referred to as an Empty Gestational Sac (Site not responding. Last check: )
		A blighted ovum (empty gestational sac) occurs when a fertilized egg implants into the uterine wall, however, the fetus does not continue to develop past the sixth to eighth week of gestation.
		With a blighted ovum (empty gestational sac) many pregnant women believe that their pregnancy is going along just fine due to the rising hCG levels from the placenta.
		The true cause of a blighted ovum (empty gestational sac) is not known, however, most believe it is due to abnormal chromosomes within the fetus.
	www.ourmiscarriage.com /blighted_ovum.html (563 words)

	The Misdiagnosed Miscarriage Site
		The gestational sac continues to grow but the baby does not grow within the sac.
		Additionally, the outline of the sac may be irregular, incomplete or absent decidual reaction and/or fluid found in the gestational sac.
		We have seen a number of cases where either the baby or the yolk sac is not found within the gestational sac until the sac was bigger than these measurements.
	www.misdiagnosedmiscarriage.com /blightedovum.html (1486 words)

	Case Discussion & Answer - 08/16/06 (Site not responding. Last check: )
		In addition, there does appear to be a "double decidual sac sign", the dual layer around the gestational sac that indicates it is a real (and not a psuedo-) gestational sac.
		While some radiology texts mention the double decidual sac sign as the earliest sign of IUP it can be difficult to determine, especially for sonographers without significant experience.
		If you aren't sure you see a yolk sac it is certainly reasonable to call it NDIUP (no definitive IUP), and check a serum beta/ formal imaging/ consultation or early f/u.
	www.acep.org /webportal/membercenter/sections/ultra/videoarch/081606-answer.htm (240 words)

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