Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . Patchy ill - defined opacities are noted within the left mid lung field . Lungs are well inflated . There is no pneumothorax . Minimal blunting of the right costophrenic angle may reflect pleural thickening or scarring . No large pleural effusion is noted . No free air is seen under the diaphragms . No acute osseous abnormality is detected .
    OUTPUT:
    
No free air is identified under the diaphragms . Patchy ill - defined opacification within the left mid lung field may reflect an infectious or inflammatory process .