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1.Vacume phenomenon - presence of air in the joint space, due to infective / inflammatory changes in the joint. In your case its seen in cost
vertebral joint ( vertebrae and ribs)
2.The report also indicates degenerative changes with presence of osteophytes and inflammatory changes in the facet joint at C2, C3 vertebrae level.
3.The possibilities of this changes could be as said in report - hyper mobility.
4.Rudimentary
cervical rib - is normal variants, which you don't have to worry about.
5.All these changes are age related / hyper mobility / weight bearing work.
simple exercises, reduction of work,
physiotherapy are the treatment of choice.
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.