Pain in the region you note could originate from the cervical spine, the thoracic spine or the right shoulder. The images you sent are not enough to come to some sort of diagnosis. The correct way to diagnose a condition is with a thorough history, a complete physical examination, a careful analysis of the images and potential use of diagnostic injections (SNRB/ESI-see website).
Most commonly, cervical herniated disc or foraminal stenosis is the first disorder to look for and rule in or out. Thoracic disc hernation would be the second, shoulder disorder the third and finally, insertional muscle disorders (like tennis elbow of the shoulder) the fourth.
There are unusual systemic disorders like polymyalgia rheumatica that can also cause this type of pain.
There are unusual times that a shoulder disorder can refer more pain than to be expected. Since you have a known osteolysis of the AC joint, an anesthetic injection into this area might give you more pain relief than you expect (see pain diary).
Dr. Corenman
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.