Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Patchy left lower lobe opacity has minimally improved from the previous study but persists . Remainder of the lungs are clear . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities identified .
    OUTPUT:
    
Persistent left lower lobe opacity , minimally improved from the previous study , compatible with pneumonia . No new areas of focal consolidation otherwise demonstrated .