Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previous left lower lobe airspace opacity has substantially improved . Hyperinflated lungs with flattened hemidiaphragms is compatible with emphysema . Small bilateral pleural effusions are new . The heart and mediastinum are within normal limits . Biapical pleural scarring is unchanged . There is no pneumothorax .
    OUTPUT:
    
Substantially improved left lower lobe pneumonia . New small bilateral pleural effusions . Emphysema .