Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . There is a subtle left lower lobe interstitial opacity , more pronounced on the lateral view . There is no effusion or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Subtle left lower lobe opacity may reflect overlapping shadows vs early pneumonia in the correct clinical context .