Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate no focal opacity convincing for pneumonia . Relative to prior study dated ___ , cardiomediastinal and hilar contours are stable in appearance , within normal limits . There is no pneumothorax or pleural effusion . Blunting of the left costophrenic angle is thought likely secondary to atelectasis . No acute osseous abnormality is detected .
    OUTPUT:
    
Mild basilar atelectasis with no focal consolidation convincing for pneumonia .