Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . There has been interval decrease in size of the left upper lobe and hilar mass . The right hilar and mediastinal contours appear unremarkable . There is no pulmonary vascular congestion , focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities are detected .
    OUTPUT:
    
Interval decrease in size of left upper lobe and hilar mass .