Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is well expanded clear . Extensive opacification of the left lung obscures the left heart border and demonstrates air bronchograms with only mild ipsilateral shift of mediastinal structures . No pneumothorax or right pleural effusion .
    OUTPUT:
    
Left lung opacification is concerning for lingular and left lower lobe pneumonia , with some element of collapse . Chest CT would be helpful to evaluate extent of consolidation and exclude central obstruction as a cause .