Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . Lung volumes are slightly low . There is linear left mid - to - lower lung atelectasis as well as left retrocardiac subsegmental atelectasis . The lungs are otherwise clear . The heart size is normal . The mediastinal contours are normal . Trace bilateral pleural effusions are not excluded on the basis of blunting of the posterior costophrenic angles , seen on the lateral projection . There is no pneumothorax .
    OUTPUT:
    
1 . Mild left mid - to - lower lung atelectasis . No focal consolidation . 2 . Possible trace bilateral pleural effusions .