Thank you for your query at DoctorSpring.com
I have read your query with diligence.
I hope you know well about cervical spondylosis.In this condition there is growth of bone of cervical vertebrae.This enlarged bone increases compression over exiting nerve at neural foramen.
Compression of these nerve lead to pain in there distribution area.It looks from your details that there is more compression towards left side.This compression does also affect vascular structures through there nerve supply,so this swelling may be associated with compression of nerves supplying to small vessels of that side.
Most probably your doctor want to see the enlargement of bone as well as there encroachment to nerve foramen.
Hope this will help you.
With best wishes.