Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained demonstrating clear and well - expanded lungs without focal consolidation , effusion , or pneumothorax . Heart and mediastinal contours appear normal . Bony structures are intact . Hypertrophic changes of the right AC joint may be indicative of AC joint arthropathy . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . Right AC joint arthropathy .