Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate hyperexpanded lungs with flattening of hemidiaphragms . Increased AP diameter of the chest is apparent . Costophrenic angles are blunted , suggestive of trace pleural effusions . Bibasilar opacities are noted . There is no pulmonary edema or pneumothorax . Subtle rounded lucencies and linear opacities , likely correspond to underlying emphysema . Visualized osseous structures are intact . Tracheal stent is fully characterized on this radiograph .
    OUTPUT:
    
1 . Hyperextending lungs with flattened diaphragms , compatible with COPD . 2 . Bibasilar opacities may represent atelectasis or aspiration with possible trace pleural effusions . 3 . Tracheal stent is not characterized . Further assessment with CT or review of outside CT exams would be helpful , if available .