Pregnancy

What are the Ultraosund findings of an abnormal yolk sac? A yolk sac that is large (76 mm), fragmented, or calcified is suggestive of an abnormal intrauterine pregnancy (

At what point should embryonic cardiac activity be detected on Ultrasound? Embryonic cardiac activity is usually visible as soon as an embryo is detectable sonographically, often at a CRL as small as 2 mm. The absence of sonographically detectable embryonic cardiac activity by a CRL ≥7 mm is diagnostic of a failed pregnancy, as is the absence …

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Ultrasound features and significance of an abnormal gestational sac On US examination, an irregularly shaped gestational sac that is low-lying and surrounded by a weakly echogenic and thin rim of decidual reaction is 90% to 100% predictive of an abnormal intrauterine pregnancy. A mean gestational sac diameter that is less than 5 mm greater than the …

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Ultrasound features of a normal gestational sac By 5 weeks of gestational age, the gestational sac is typically visible as a small, round or oval cystic-fluid collection located within the decidua of the thickened and echogenic endometrium along the upper uterine body. The gestational sac grows at a rate of 1.1 mm/day and is typically visible …

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What is typically evaluated during obstetric Ultrasound in the first trimester? • Presence or absence, and location of a gestational sac. • Presence or absence of a yolk sac and of an embryo within a gestational sac. • Dating of a gestation based on the mean gestational sac diameter and, when possible, preferably on the embryonic crown-rump length …

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What are the indications for ultrasonography (US) in the first trimester? First-trimester US is commonly performed for both symptomatic and asymptomatic pregnant patients for a variety of reasons, including: • Confirmation, dating, and assessing viability of an intrauterine pregnancy, especially when the last menstrual date is uncertain. • Evaluating the etiology of vaginal bleeding, pelvic pain, or …

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What types of imaging are permissible in pregnancy? A variety of imaging modalities, including those that use ionizing radiation and those that do not, can be used in pregnant patients. Pregnant patients are consented for possible risks to themselves and their unborn children before the imaging is performed. MRI and US are generally considered as …

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