Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal with mild tortuosity of the thoracic aorta . Hilar contours are normal . Previously appreciated retrocardiac opacity is increased with a lateral correlate in the posterior left lower lobe concerning for pneumonia . The left lung apex and right lung are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increasing left lower lobe opacities worrisome for pneumonia . Results were discussed over the telephone with Dr . ___ by ___ at 11 :50 a .m . on ___ at the time of initial review .