Thanks for writing in.
I read your problem,i would like to inform you that impacted wisdom teeth can be associated with cyst/tumor
As you provided the detail and your CT scan
report says that there is 'density under the jaw', it seems that there is a cyst related to your impacted tooth
So i will suggest you please visit an oral surgeon in your area as soon as possible and the thorough examination done and take a proper treatment.
Nothing to get worried.