The whole thing might be just

來源: mdgg 2007-09-08 19:11:29 [] [博客] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (395 bytes)
some sort of over reaction because of misunderstanding.

Who using what method diagnosed what kind of primary embryonic cardiac mesenchymal tumor of the fetus???

But to answer your curious question:
1) cells/tumor do not cross blood-placenta-barrier unless the tumor metastasized to the placenta
2) yes, in many medical conditions such as significant deformity of the fetus.
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