Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate median sternotomy wires which appear intact . Several clips project over the left mediastinal border . Cardiomediastinal and hilar contours are similar to study dated ___ . Lung volumes are low . Perihilar peribronchial thickening may reflect small airways disease . There is no overt pulmonary edema . No focal opacity convincing for pneumonia is identified . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Perihilar peribronchial thickening with low volumes and vascular crowding . No focal opacity convincing for pneumonia .