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No periods. Ultrasound shows pregnancy but yolk sac and fetal pole not recognizable. What does this mean?

Hi Doc, I did an ultra sound after i realize that my period didn t come for two months . The doctor then told me after the Ultra sound results was given to me that i am pregnant. He said that my Lungs . liver , bile duct , pancreas spleen are normal. But in the Ultra sound he could not recognize Yolk sac/ fetal pole not seen in the study .Can you explain to me what this means .
Asked On : Tue, 11 Dec 2012
Answers:  2 Views:  531
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OBGYN 's  Response
Mar 2013
I appreciate your query.
The gestational sac(GS) is the earliest sonographic finding in pregnancy. It will be difficult to see if the mother has a retroverted uterus or fibroids.
In case of ectopic pregnancy, the GS is not seen inside the uterus.
The GS is identifiable until approximately 4 1/2 weeks only with a transvaginal scan.
The yolk sac appears during the 5th week. It is the second structure to appear after the GS. It should be round with an anechoic centre.
Failure to identify (with transvaginal ultrasound) a yolk sac when the gestational sac has grown to 12 mm is also usually indicative of a failed pregnancy.
A mass of fetal cells, separate from the yolk sac, first becomes apparent on transvaginal ultrasound just after the 6th week of gestation. This is called the fetal pole.
These parameters are seen on transvaginal ultrasound only.
Since you probably had an abdominal ultrasound, these details might not be seen easily in early pregnancy.
Please go for a TVS and then consult a gynecologist for further details.
Absence of yolk sac/ fetal pole beyond gestational sac size > 12 mm is usually indicative of a failed pregnancy, as I mentioned earlier.
All the best and do post your TVS reports for further clarification.
Answered: Wed, 12 Dec 2012
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General & Family Physician Dr. Nsah Bernard's  Response
Dec 2012
At this early stage differentiating the various parts is very difficult. I'll suggest you exercise some patience and give it some time like 2-4 weeks when pregnancy is a little advanced and when fetal parts start showing. You can repeat the ultrasound, if possible by an obstetrician/ experienced doctor/ radiologist, then from there we can derive any suitable conclusion.

Best wishes
Answered: Tue, 11 Dec 2012
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