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... show more 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!
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