Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , semi-upright AP . There are linear opacities in the left lower lobe with blunting of the costophrenic angles , which is explained by scarring and pleural calcifications seen on the CT . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
No evidence of pneumonia .