Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle left lower lobe opacities are new concerning for infection . Right lung is unremarkable . Prior sternotomy was done for mitral valve repair and tricuspid annulus plasty . The cardiac contour is not dilated . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
New left lower lobe opacity is concerning for pneumonia . This was discussed directly by telephone with Dr . ___ .