Thyroglossal duct cyst - midline

[PlateSpinnerJuggler]

So one of my DDs has the above.
We spotted it when she was 3 shortly after she had chicken pox - so probably the virus caused it to flair/grow and become apparent for first time.

At that time we were advised it was small and to leave it as it may never grow more and is causing no issue.

Since then it has grown.

She had an ultrasound just before covid and unfortunately I then didn't follow up until recently but knew from the sonographer at the time that it wasn't causing any issues.

But I followed up with gp recently for the results and it had grown to March 2020 (5-6years on) 3 fold.

I have an ENT appointment scheduled next month, but really wondering frim anyone experienced if there is a size above which it is recommended to remove??? Or if only it causes issues on thyroid or other areas?

I'm sure they'll scan again as we are a year and half on now... DD is now 10 and a half...

Thanks for any input!
From a curious mama

Hi! I'm London based (north)
My daughter is 12 now - we have done nothing with it- spotted at 3.
We rechecked as it had clearly grown but ENT confirmed it had grown in line with her growth and he said he would leave it be.
That ENT was called Elliott Benjamin I think most of his clinics are north London based but may have a central based one too.
I also recall when I first researched doctors planning to see Ben Hartley - as he is Great Ormond street and Portland based so I assumed from that must be good...

Is this similar ? I'm waiting for an urgent apt. Just so stressed.