Is Spreading Pain Due to Injury?

A 53-year-old woman presents with complaints of right-side chest wall, neck, and shoulder pain. Her symptoms started two months ago, when she says she injured herself while doing yard work. She initially self-treated but subsequently went to various emergency departments and walk-in clinics on several occasions; no definitive diagnosis was established. Recently, she has noticed increasing weakness in her right arm and hand as well. Medical history is significant for hypertension. Family history is remarkable for non-Hodgkin’s lymphoma (mother). Social history reveals that the patient is a smoker, with a pack-a-day habit for at least 40 years. On physical exam, you note normal vital signs. The patient has good range of motion in her extremities; however, the strength in her right upper extremity is significantly diminished. Her deltoid, biceps, triceps, and hand grip are all about 2/5. She also notes a paresthesia along her right anterior chest wall, although sensation is intact. Chest radiograph is ordered (shown). What is your impression?