### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Age: 27 years I had my 20 weeks scan done last week (28 May 2010) and the report showed a TCD of 18 mm. I was then advised for a second opinion scan which was done on 4 June 2010 and the TCD shows 19mm. THe report says that the cerebellar growth is on the 5th centile. Fetal growth and amniotic fluid are normal. There are no obvious structural defects or markers for chromosomal abnormalities in particular the rest of the intracranial structures appear normal. Fetal cardiac scan showed a normallly connected heart with no obvious defects and normal flow patterns. The urinary artery doppler and cervical length are normal. This cerebullar growth on the 5th centile appears to be an isolated defect and in the absence of any defects the possibility of syndromic associations appears to be low. Is this a cause for worry? My Gynaec has asked me to do a rescan after 2 weeks. Is there a chance of the growth spurting back to normal levels in 2 weeks? Please advise

### output:

Hi there, A low value of cerebellar diameter should be always seen with other parameters which could give an overall view. If it's an isolated defect it should not cause you to worry so much. After all ultrasound findings are only there to identify problems when there is a defect, if no other defect is seen this should be taken very positively by you. The cerebellar values are usually only checked in the 2nd trimester, a repeat scan will confirm that there are no co-existent anomalies. This scan must have been recommended by your gone to confirm the same. So do not be over concerned about it. Hope this helps. Regards.