Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates mildly hypoinflated lungs . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Mild persistent left lower lobe atelectasis .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Persistent left lower lobe atelectasis .