Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral radiographs of the chest demonstrate mild right greater than left lower lobe atelectasis . The lungs are otherwise clear . Mild cardiomegaly is noted . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Mild cardiomegaly . Mild lower lung atelectasis .