Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left hemidiaphragm is obscured , likely due to atelectasis at the left lung base . The use right lung is clear . The heart is moderately enlarged . Mediastinal contours are stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Obscuration of the left hemidiaphragm , which likely due to atelectasis of the left lung base . No evidence of overt edema .