Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . The right lung is clear . There is no pneumothorax or right pleural effusion . There is mild elevation of the left hemidiaphragm unchanged from prior . Opacities in the left lower hemithorax have markedly improved with residual probably scarring . Blunting of the left costophrenic angles could represent a small effusion or pleural thickening . The osseous structures are unremarkable
    OUTPUT:
    
No acute cardiopulmonary abnormalities . Minimal residual linear opacities in the left lower lung likely scarring and small left effusion and or pleural thickening