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two yolk sacs,one embryoFrom: Dott. Andrea Corda (acord@tin.it)Tue Jan 28 14:29:24 2003
Dear Colleagues, I should have in my zambeel an image of a so-called double bleb sign (and I'll search for it and send it if you like),but I clearly remember that of the two partially fused rings,one had a thicker wall (and it was the yolk sac:the reason being the vitelline vascular net on its surface,as Dr.Moroder said),the other-the thinner-was the amnion of an aborted embryo-early demise with subsequent reabsorption-as usually happens with chromosomal anomalies-this is the in-between picture that ends up with a blighted ovum-and the mean outer diameter of these double-blebs is -almost always-bigger than usual (usual diameter of the y.s. being 5mm more or less).So,at the very beginning (2-3 mm CRL),the amnion wraps around the developing embryo and it does not show on the ultrasound-and the embryo is stuck to the secondary y.s. wall-like any caption from a textbook of embryology can show.(again,in accordance with Dr.Moroder). In Dr. Libardi's case I stated we're dealing with a monochorionic diamniotic pregnancy-therefore there are two separate yolk sacs,no double bleb sign,maybe a slight disproportion between the two embryos-although I think that a slight difference in the angles of the scan could have shown both embryos. In the end,the follow up is everything Andrea Corda MD
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