Yes, PMR can affect the clavicle area, at least according to the rheumatologist Dan Bunker who made a presentation to a medical school class entitled " Polymyalgia Rheumatica, what has changed since 1957?" You can find it on YouTube. He uses ultrasounds and PET scans, not x-rays, to show inflammation. Either end of the clavicle can be affected, at the sternum or shoulder. When my PMR was very active I had pain in my rib cage, making it painful to take a deep breath. I also had stabbing pains under my shoulder blades as well as diffuse pain that went from one shoulder to the other. Many of the odd pains I did not mention to my rheumatologist because they are looking for classic symptoms (which I also had) and I did not want to be pigeonholed as a psycho female chronic pain patient!