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).
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