Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . There are linear areas of opacity in the right base likely reflecting atelectasis . No focal airspace opacity is detected to suggest pneumonia . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Atelectasis at the right base but no evidence of pneumonia .