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3-032, 3-05d. [ edit on Wikidata] Obstetric ultrasonography, or prenatal ultrasound, is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in the uterus (womb). The procedure is a standard part of prenatal care in many countries, as it can provide a ...
The anomaly scan, also sometimes called the anatomy scan, 20-week ultrasound, or level 2 ultrasound, evaluates anatomic structures of the fetus, placenta, and maternal pelvic organs. This scan is an important and common component of routine prenatal care. [ 1 ] The function of the ultrasound is to measure the fetus so that growth abnormalities ...
In another study values of 79.6% and 2.7% for the combined screening were then improved with the addition of second trimester ultrasound scanning to 89.7% and 4.2% respectively. [13] A further study reported detection of 88% for trisomy 21 (Down syndrome) and 75% for trisomy 18 (Edwards syndrome), with a 3.3% false-positive rate. [14]
The second trimester is defined as starting, between the beginning of week 13 (12 weeks +0 days of GA) [4] and beginning of week 15 (14 weeks + 0 days of GA). [36] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 36 ] or end of week 28 (27 weeks + 6 days of GA).
The first, second, combined, and third trimester screens typically consist of an ultrasound (abdominal and/or transvaginal) and maternal blood/serum testing. The ultrasound is used to visually assess the growth, development, and activity of the fetus through imaging observations and measurements.
Abdominal ultrasound can be used to visualize the insertion site of the umbilical cord. [ 3 ] [ 4 ] Overall, visualization is most successful in the second trimester, [ 13 ] however routine ultrasound examination in the second trimester may not detect velamentous cord insertion if the condition develops after the remodelling of the placenta as ...
Cervical weakness. Cervical weakness, also called cervical incompetence or cervical insufficiency, is a medical condition of pregnancy in which the cervix begins to dilate (widen) and efface (thin) before the pregnancy has reached term. Definitions of cervical weakness vary, but one that is frequently used is the inability of the uterine cervix ...
Chorioangioma, or chorangioma, is a benign tumor of placenta. It is a hamartoma -like growth in the placenta consisting of blood vessels, [1] and is seen in approximately 0.5 to 1% pregnancies. [2] It is mostly diagnosed ultrasonically in the second trimester of pregnancy. Large chorioangiomas are known to cause complications in pregnancy ...