Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Streaky left basilar opacity likely reflects atelectasis . No pleural effusion or pneumothorax is present . No acute osseous abnormalities are detected .
    OUTPUT:
    
Left basilar opacity likely reflecting atelectasis , although infection in the correct clinical setting can not be excluded .