Transcervical sonography: an investigational technique for visualization of the embryo.
other · Level V
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Abstract
A catheter-based, miniature ultrasound transducer, operating at a frequency of 12.5 MHz, was introduced transcervically into the uterine cavity of 18 pregnant women about to undergo first-trimester abortion. Transcervical sonography showed the yolk sac and embryonic structures, such as brain vesicles, limb buds, liver, spinal canal, and umbilical cord with blood flow, in eight embryos at 5-8 menstrual weeks of age. As an investigational technique, catheter-assisted transcervical sonography offers a new diagnostic approach to imaging of the first-trimester human embryo.
Medical subject headings
- Embryo, Mammalian
- Ultrasonography, Prenatal