The fetal pole is a thickening on the margin of the yolk sac of a fetus during pregnancy. It is usually identified at six weeks with vaginal ultrasound and at six and a half weeks with abdominal ultrasound.[1] However, it is not unheard of for the fetal pole to not be visible until about 9 weeks. The fetal pole may be seen at 2–4 mm crown-rump length (CRL).
References
edit- ^ "Fetal pole | Radiology Reference Article | Radiopaedia.org". radiopaedia.org.
 | This developmental biology article is a stub. You can help Wikipedia by expanding it. |