Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Median sternotomy wires are intact . Mild cardiomegaly may be minimally increased . Mediastinal and hilar contours are normal . The lungs are hyperinflated but clear . There is no pulmonary edema . There is no pleural effusion or pneumothorax . Degenerative changes in the thoracic spine are re - demonstrated .
    OUTPUT:
    
1 . Mild hyperexpansion of the lungs without evidence of pneumonia . 2 . Stable to slightly increased mild cardiomegaly .