Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear . There is new diffuse patchy opacities throughout the left upper lobe and lingula . The left hemidiaphragm is slightly elevated . There is a more dense opacity compared to the prior study and is concerning for either a mass or more confluent consolidation . Prior radiation changes are also seen within the left lung . There is a small pleural effusion on the left . The mediastinal and cardiac contours on the left are blurred by superimposed lung opacification . The right mediastinal and hilar and cardiac contours are normal . Pacemaker is in place with biventricular leads in the appropriate position .
    OUTPUT:
    
Left upper lobe opacification with mild volume loss concerning for pneumonic consolidation and possibly post-obstructive pneumonitis associated with a new central mass , radiation stricture , or mucus plug . More central denser opacity may represent mass or particularly dense area of consolidation . CT is recommended to better assess if needed clinically , preferably with intravenous contrast if no contraindications exist . These findings were discussed with Dr . ___ at 3 :30 p .m . on ___ by telephone .