Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild asymmetry in the left lower lung base could be a region of developing pneumonia . The heart size is top normal . No pulmonary edema , pleural effusion , or pneumothorax is seen . The previously described lung nodules are not well seen on this study and better evaluated on recent CT Chest .
    OUTPUT:
    
Mild asymmetry in the left lower lung base could be a region of developing pneumonia .