Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are noted to be decreased . Allowing for differences in technique , the previously described subtle opacity in the left lower lobe is no longer identified . The remainder of the lungs are essentially clear without pleural effusion , pneumothorax , or overt pulmonary edema . The heart size is normal . The aorta is noted to be tortuous . Mediastinal and hilar contours are otherwise normal .
    OUTPUT:
    
Interval resolution of the patient 's previous left lower lobe opacity .