Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The linear opacification within the left lower lung likely represents subsegmental atelectasis . Otherwise , no focal consolidations to suggest pneumonia . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No evidence of pneumonia .