Lump on top of head

Hi all,

About 2 months ago I came across a small lump on the top of my head, near the crown. It's hard and immovable - feels just like bone - and is painless. I don't think it has got any bigger and has the appearance of regular skin. I have no other symptoms.

I went to the doctor about a month ago and she initially told me to just keep an eye on it, a sort of 'these things happen' response, that it probably wasn't anything to worry about. However a couple of hours later she called me and referred me for a CT scan just for a bit of reassurance.

This obviously supercharged my anxiety. I had the CT last week but I still haven't heard anything so by posting here I'm just looking some opinions on what it might be?

Thanks in advance!