Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs were acquired . There is subtle increased heterogeneous opacity near the left costophrenic angle , projecting over the lower thoracic spine on the lateral radiographs , possibly atelectasis or though early pneumonia is not excluded . The lungs are otherwise clear . Heart size is normal . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax .
    OUTPUT:
    
Left lower lobe minimal atelectasis versus early pneumonia . Correlation with physical exam recommended .