Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity is seen projecting over the lateral right mid lung which may be due to overlap of structures , but underlying pulmonary opacity is not excluded . The lungs are relatively hyperinflated , suggesting chronic obstructive pulmonary disease . Minimal left base atelectasis is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable . No displaced rib fracture is definitively identified . However , if clinical concern persists , dedicated rib series or chest CT is more sensitive .
    OUTPUT:
    
Subtle opacity projecting over the lateral right mid lung may be due to overlap of structures , but underlying pulmonary opacity or even rib fracture is not excluded . Findings could be further assessed with shallow oblique radiographs or chest CT . No displaced rib fracture definitively identified . However , if clinical concern persists , dedicated rib series or chest CT is more sensitive .