What is Transcerebellar Diameter (TCD) and whats the normal measurements?
I just had a ultrasound done and I'm looking at my fetal measurements scan and I've come across Trans cerebellar Diameter (TCD) the doctors and midwifes haven't told me anything and the internet has virtually nothing on this topic either. Does anyone know what this is? and what the normal measurements for a 33 week fetus is? as mine say 46.3 mm >95%
I hope its normal!
- noaLv 79 years agoFavorite Answer
5 different sites i've tried, they all give info on TCD but I found them virtually impossible to transcribe back to you. It seems it's only done the odd time for research and absolutely nothing to worry about.
Have a look at radiology.rsna.org, you may have a better understanding than I did.
Best of luck with your new baby. x
- 4 years ago
TCD is the widest diameter across the cerebellar hemispheres
Normal TCD graph :-
(± 2SD, wks)
12-18 wks ± 1.0 wks
18-24 wks ± 1.8 wks
24-30 wks ± 2.0 wks
30-36 wks ± 2.4 wks
36-42 wks ± 3.2 wks