Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unchanged cardiomediastinal and hilar contours . There is a new opacification within the left lung base as well as new reticulonodular opacifications in the right lung base . Findings are concerning for left lower lung atelectasis vs pneumonia .
    OUTPUT:
    
New left lower lung opacification , atelectasis vs pneumonia .