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Re: I: yolk sac and early pregnancyFrom: DRoss38040@aol.comFri Jan 15 17:10:59 1999
In a message dated 1/15/99 2:20:07 PM Eastern Standard Time, acord@tin.it writes: << Got a number of cases concerning abnormal size and growth of yolk sac and early pregnancy failure,namely:abnormal yolk sac growth from the very early days (i.e. since its first identification via TV scans).This means,for example,that if I measure a CRL of 4 mm in a viable embryo I should find a similar diameter of the yolk up to the size (mean) of 5 mm ,when the embryo goes on growing and the yolk sac remains more or less of the same size.If I find a yolk sac diameter of,say,7 mm and a CRL of 4 in a viable pregnancy,there are two possibilities:1)spontaneous abortion in a few weeks or days or 2) a subsequent chromosomal abnormality detected either via CVS (abnormal nuchal fold) or amniocentesis.Up to now I've collected a number of trisomies (21,18,13,15 and 22 ,Klinefelter)and monosomies (Turner) using this simple rule (you can use it as a rule of thumb:in the early phase of every pregnancy yolk sac and embryo grow together with the same rate up to the size of 5 mm;if the yolk sac grows at a faster rate then something wrong is happening.A >> This is a very exciting finding, and I hope we will be able to see more of your information, Dr. Corda!!! Thank you for posting! Diana Ross, RT, RDMS
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