Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube terminates 5 cm above the carina . There is a coarse linear opacity in the left lower lung . The right lung is clear . There is no pleural effusion or pneumothorax . Cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Coarse linear opacity in the left lower lung which may represent early pneumonia , recent aspiration or bronchitis .