Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Increased apparent attenuation along the left mid to lower lung is felt most likely to represent artifact associated with slightly asymmetric positioning and overlying soft tissue attenuation . Bony structures are unremarkable .
    OUTPUT:
    
Heart at the upper limits of normal size . No evidence of acute disease .