Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle streaky opacity in the left lower lobe may reflect atelectasis , though infection can not be entirely excluded . There is no pleural effusion or pneumothorax . There is no central vascular congestion or overt pulmonary edema . Mediastinal and hilar contours are normal . Heart size is normal .
    OUTPUT:
    
Streaky left lobe opacity may reflect atelectasis , though infection can not be entirely excluded . Recommend correlation with physical exam and laboratory data .